{
  "manageEntity": {
    "action": "Save",
    "entityId": "548719",
    "entityType": "Track",
    "nonce": "0xeea6c60826aa253af67c3e2df8c9a9fe9b2249c4c879cc4e47c39f24dde95fc4",
    "signature": "0xbaf96bfa6289774c759fc631a20de81d01d1406b60783c708bac492cdf7b1e8866159ba7f41ae171ffb793d0d76c6d7e96710c815d8b259ffbc2d787a1abf32d1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}