{
  "manageEntity": {
    "action": "Save",
    "entityId": "819850548",
    "entityType": "Track",
    "nonce": "0xe1a43d97b86f05918bc8c811be38368833d497c0579c95aa99337c64478f7401",
    "signature": "0x52269c5d409ec3355c68a2908d39aa2b15ccd8d2b290fed8e5e874a322b0f4c91b94ee375830b0ee939ca161fb75a97abe37dc9c0ffc79ddb8b35bf46296e1d31c",
    "signer": "0x41FF0e9C13C17eAa53E74Cba28CD9D9101440565",
    "userId": "854095053"
  }
}