{
  "manageEntity": {
    "action": "Save",
    "entityId": "999974",
    "entityType": "Track",
    "nonce": "0xaa117153f00fab0651f0ad7a0e341f0e4a65b556a433e8754618d7c53e5f1d17",
    "signature": "0xfd93976bbd020c909727032d3c10b9dec046023cf87e533ea25bd51832967ede791421810013630392d7b189a260c4156f5b22b5accb5014feff28e6d54a4bfb1c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}