{
  "manageEntity": {
    "action": "Save",
    "entityId": "149207506",
    "entityType": "Track",
    "nonce": "0x66ba22e2e76ff6ef6c08cce9b611e77bc2531d615f08c356257edc08a42b4c40",
    "signature": "0x757bcf98633014ac5028344083459a2645a6545e95c659c9bc166312508447cf12e3eaa26dc99a812f8b6dfeb7dcc44fa8c275c68fa9025d0d0e4168b826bb231c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}