{
  "manageEntity": {
    "action": "Save",
    "entityId": "1552905498",
    "entityType": "Track",
    "nonce": "0xc0cc235efc664fba1d7e39a14c9541347dbc06e005ca7e7c51c171ee847f2735",
    "signature": "0x19d62cea49fb67e6cea914b67e518866ee842adfd2eb2ea9f46bdf3f113718df09dd403eea40e388e73f1eb59582ca8e264cb081b15ae79b2602381cfba1e0451c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}