{
  "manageEntity": {
    "action": "Save",
    "entityId": "877461744",
    "entityType": "Track",
    "nonce": "0x9e47a4d528ac3c89a00bcb380cc44fd0b981f13dc2bf3cb46ad966517b63a9db",
    "signature": "0x4afc9ede85c1247cb27d9c4e80c20809d063219d53eb587702bb565c28991c0b0c391b7e69c5788d110fcd58a9b4c55a528b34702d0331c853235f116460c3ba1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}