{
  "manageEntity": {
    "action": "Save",
    "entityId": "1789568890",
    "entityType": "Track",
    "nonce": "0xe202803f32c6277b7cd72cbd65f24198540ecba56a1592fd3c0a7265dbf8273a",
    "signature": "0x6c8bb9d567bef21b5bbc78f559a3e34f03fe95dad20637e46d894ee177ce07ad56f40327341ae0bae0fe677471a22d22b2b776e38c0d7ce3e504d3cfd5d40bf41b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}