{
  "manageEntity": {
    "action": "Save",
    "entityId": "672322549",
    "entityType": "Track",
    "nonce": "0x5f4681b1ce4c20ed2a69352087adc91310f1db03595047478dd44ff43be01025",
    "signature": "0x863f1bbb64259a2d8f5d81be14621f843adaaf4bc7e425b9d5f882f2e92152f965e1ab659323ce7fb38e956b6f6106b0a83ab3e1584fd359077c0be388463e551b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}