{
  "manageEntity": {
    "action": "Save",
    "entityId": "483542491",
    "entityType": "Track",
    "nonce": "0x1a7a2907a0ec89eea402194813995ef91c5b603d3f6b0b08413efe550097d4c4",
    "signature": "0x1c39fae88eada393478a2a6e1ca0a309cd3ebfe0e46c8c00c2a7ba3335ff4e0055390b5b8cf7c7628b557bb9b08f5f1dec9743dc6055f489a8e56ef7313b07ef1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}