{
  "manageEntity": {
    "action": "Save",
    "entityId": "291570",
    "entityType": "Track",
    "nonce": "0xf679dfb6e3e5da4ce32fc6d6f03d7a3f6583c49fedf94ad55449fc1bcd20e46d",
    "signature": "0xeebc0562594ce673ba5da5581058f429a3ef877f9fdfec45ff37292bcb1317c519ef7f38f65d9a8c695b44f7268dd9d26eec34c15207a27a23f78d0c1a216c2a1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}