{
  "manageEntity": {
    "action": "Save",
    "entityId": "879603444",
    "entityType": "Track",
    "nonce": "0x91121a7b37c2e90d52880b4608952a9529e7f916e537e30615bc899c7de6a7cc",
    "signature": "0x0e5efc1347b5cce49440aca4bb0f3fa30e5229e8560cfaa465c5bc6550e763680f97ddefec0c9e31aa917c1a4015d082da3b0d7f9c148d1385e4c832ae8a5d951b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}