{
  "manageEntity": {
    "action": "Save",
    "entityId": "920207685",
    "entityType": "Track",
    "nonce": "0x0b1b6d8cfb126800b101cdd6a2413f7055419b0453474a164affb33ca8745658",
    "signature": "0xb8e4f3f14297bfb3dd7d50ffaf466bdbb06c5e25207472811240cf6eb5099c6c1c2f358b80ad32e28eac283a8c3d18f8b9734955734c1c77f06a63e0a2530b661b",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}