{
  "manageEntity": {
    "action": "Save",
    "entityId": "729627",
    "entityType": "Track",
    "nonce": "0x800cf2e68c12bfdad4672bf76e46a93054dc34953fde8581ec33abf1d83f2349",
    "signature": "0xab1afdbcb2389f444ff7d0cde81bc379df0a055ebadfaa4d1369ae7dc3fb1d6c635c56336728ad986280385949e75e42d740a0a56c327e71f6078174b3f17c881c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}