{
  "manageEntity": {
    "action": "Save",
    "entityId": "789558985",
    "entityType": "Track",
    "nonce": "0xc781963f4b52afa2f2907597ae63a9d69272eb04af5d80b4196342b4c5ce51fe",
    "signature": "0x2a76be2760c1d5439420138789d66fc931dd94fe18f5e5eb3af3973e9ec844f14731bb19611a8965f88242294e904b75fe9f0981409afa70caee92d763f9f5a91b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}