{
  "manageEntity": {
    "action": "Save",
    "entityId": "555354977",
    "entityType": "Track",
    "nonce": "0x030857403cba4bb520dd7888fd9a97c8c8b7732c5b47e86e06c0b2f3229528d1",
    "signature": "0x9e5bd42a623e9ac65ccf9d87fa12721698b56474cc534a10dbdfc29d44e561282329c676e741ec8137c146ad3e46343d73ee2c17105e04bc4977b5a44770e2351c",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}