{
  "manageEntity": {
    "action": "Save",
    "entityId": "203927317",
    "entityType": "Track",
    "nonce": "0x421d6ec5744e01f3ba6e91eaff704f95e3aee560969ad64de87a76886fcbb4a8",
    "signature": "0xdc31d40efbb46d9d67c1797fdc6d83b19476a8d3dd52877a0ee06d9036c172b72dfa9b8aa45d59286f2b3681e5392ab2ad42f8cc274520e4aff6f438f71362691c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}