{
  "manageEntity": {
    "action": "Save",
    "entityId": "619376232",
    "entityType": "Track",
    "nonce": "0x6d9a2f44952eb8fc5025af60e0851e5f1dcbba8ed25077eaa221e24740518d58",
    "signature": "0xd4016d5d6098ff6a8c95e89e16977f641a53d9e11b6cf8a1ad81bec16416da8440c16678b22a2c575a53034df90f90cc70add81a206b60897475fa11781b91e31c",
    "signer": "0x9765cbE8e26a2c6c4847C1B69ABeB0B5250EC254",
    "userId": "678556080"
  }
}