{
  "manageEntity": {
    "action": "Save",
    "entityId": "290159",
    "entityType": "Track",
    "nonce": "0x5ef978c8878938d55fb69ee649132ecb3ccf5134c6b3c34db1ba46594083c915",
    "signature": "0x44a5f0b39d04a0485b630738bc93b112513ecabff10fe39588b19ada1126563e6b4b4e2e5c3a21bb2e7ec09947113c9e7be8b040112555d4c59be2a0a7db57f91c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}