{
  "manageEntity": {
    "action": "Save",
    "entityId": "657029533",
    "entityType": "Track",
    "nonce": "0x5b4b8d73c1700b24ebc7ab7ddfb75b5d45935ffd9892e42682e0749fd97b0b14",
    "signature": "0x9f66f0bdaf3b9fccace0f320604ff7d715a406b3486d19e6b5df7ce7138d4ebd04b8a3972ed2b6e129ec68b71daa75747d0e550aebffde7aed3de751791bb13a1b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}