{
  "manageEntity": {
    "action": "Save",
    "entityId": "1590964831",
    "entityType": "Track",
    "nonce": "0x14f84985f1e2889793405cc9929b738a30a0586e5252b06ab14b1bb75fddd00b",
    "signature": "0x0d15b17affddf1ddaa0cf32431d58abdcd4fbb1ed9cb20c7680eb43ab78ae3534fda97bfca6b9138804809945c5fca1c7ee1cc31377793987e6367d63ab2d48f1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}