{
  "manageEntity": {
    "action": "Save",
    "entityId": "804078527",
    "entityType": "Track",
    "nonce": "0x51a006f51b381d571fac6d4c92295f0c74f36550e09bbe0e0810010cec8d738b",
    "signature": "0x590357965e593dc5edfae55bdfadb7a6077681149a67a485a9c5e4ef0c05dbf2382a9861468049fc3e5b5ddce3c0a2715146040c881d9f66347473d60788bb491c",
    "signer": "0xAD614C578d791AA2538Fbfde30C97c8EFb69756d",
    "userId": "906447444"
  }
}