{
  "manageEntity": {
    "action": "Save",
    "entityId": "388347",
    "entityType": "Track",
    "nonce": "0x28eded8413b8ca67d131c23871f896ef579c198e9cc463dea1e89e14e471cf2f",
    "signature": "0xeaf74d5f316136366237891c1c6826f61121cba921f4eca7a560a6c2545569972461f5301e400093d892ffcc984b5639889904418c8b6f1a33c030a8f5b7ecad1b",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}