{
  "manageEntity": {
    "action": "Save",
    "entityId": "263156447",
    "entityType": "Track",
    "nonce": "0xddaf91e9f0d2df2a3d33f2bb736c1a69146889c7c0a2c5fd58f93de9c6ab2974",
    "signature": "0x1eaee1694a941ccc20d3ee20d719e92db46f9333f82647759b73be801e8cbaf9319379049ccc59d3ad5e80b72309c9bfa5d6247bd50b85741fb8de9c2e2a72ab1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}