{
  "manageEntity": {
    "action": "Save",
    "entityId": "759950837",
    "entityType": "Track",
    "nonce": "0x8f5a29667717bbba3fdd6efe1a5e3ecbdaad8bffa862b0ea94c98fbe4ded72cc",
    "signature": "0x401ecb54dc87db4c42d97a84cf8a07ba6e5f8fb6be314c62c07d0209617145fe65a8d04763c62c472dc46aca2393ab5bca32e555284c61173755cfe1e8d707c71b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}