{
  "manageEntity": {
    "action": "Save",
    "entityId": "290784712",
    "entityType": "Track",
    "nonce": "0x149cab7e8cd07399b6542fbaab9833a7104dcc9b0ad05610e2c95b1ee38bfb13",
    "signature": "0xb6c8dae6068a5325cf2810168bc2aea8ded31ac4fbddd44df50eadb2aca209395455361fc86b3408c7029bf076d21a142253ae7824d8e6c327bb797c6129847e1b",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}