{
  "manageEntity": {
    "action": "Save",
    "entityId": "195673810",
    "entityType": "Track",
    "nonce": "0xd72ed751660faddf7d15802085739cc1b839956d5f4d86fa2024fa0bde7a9beb",
    "signature": "0xc91b3d8985e5d74b7f7c90f1208287e535499a64efa2911933a79c0775dcbf8856d6428af20f60ad64c87b4c22a232349d61c6a4bdaeb0fa83e329062df810c91b",
    "signer": "0x4089d1751487aA665C895419F2578a6Cf33BE481",
    "userId": "728155533"
  }
}