{
  "manageEntity": {
    "action": "Save",
    "entityId": "138299",
    "entityType": "Track",
    "nonce": "0xd6f4f31119b11e75049353e81ba18ac097c78861e9aa11737876ef1b074caa1e",
    "signature": "0x776bce6212f7b068a9d60228905c2b82140b03fa869b9ea5aced05d23010ff405e734d6ba89c2df35d552f2fb8fd1d72903f86f28b9526c95fa8763c507cb1b01c",
    "signer": "0x59765b22C96E88dA578af23E8611d6ca2dcCd7C9",
    "userId": "377610060"
  }
}