{
  "manageEntity": {
    "action": "Save",
    "entityId": "775958217",
    "entityType": "Track",
    "nonce": "0xa6b72e2497b0de1e415f319b007d27aff62e3ec7dd8592254e79d965cc292981",
    "signature": "0x1c8cb088e29cfae435ca5f0d2f6b669268eaad537e7e3f450b4790232e51504706d361c066ec87016ede6c45d7227d84b3e06ca698b2db2b7fa0fa39a77cfbf41b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}