{
  "manageEntity": {
    "action": "Save",
    "entityId": "77835739",
    "entityType": "Track",
    "nonce": "0x20f75b80a13f0837b880145c6f28caf1b50167f3791c12e09707b6bfa50ae385",
    "signature": "0x264e4878f30b6ba9b4a3861e3a92216f96d2aa6ef31c2dacc9b123654706aa4d4279578843778644d9a1397d4f00e46e3f37f412226b3e180d65ff1d41487e761c",
    "signer": "0xf63b89A0Bbc03C7ec59aC257C7082A056082cDB8",
    "userId": "558452493"
  }
}