{
  "manageEntity": {
    "action": "Save",
    "entityId": "551452102",
    "entityType": "Track",
    "nonce": "0xc30bf76ce719fcc391048fe0f7eda115ae348a8a861c35ac4d65bb0da2a8b186",
    "signature": "0x65c64b4f4a30374a2e23efe3113267d11dea4fc904aa538b80a665d2e975f35407ffd169372c101fea3db290101d752582c6d52f18d4fa291ba5de0b2ff706c81b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}