{
  "manageEntity": {
    "action": "Save",
    "entityId": "2108755391",
    "entityType": "Track",
    "nonce": "0x5cebc83a629eea2474076a52df921482f4c9e6ee21a1e45470ffff1cdd32b004",
    "signature": "0x919e6d4573715e466d79d6a247d497ae90f307e5a6696f154ef89efdddbc9cf5272ccb247d82a63ade82121832dea57afe975c46abc4659676ca61fea14e86ff1c",
    "signer": "0xd3921A005099e6713f842e0c7Fb203E78a7C7Cbf",
    "userId": "125856948"
  }
}