{
  "manageEntity": {
    "action": "Save",
    "entityId": "128922868",
    "entityType": "Track",
    "nonce": "0x8cbab0bad573ed06385534e6fdba8d33a7e3042078dd1b2568742ce88be6f665",
    "signature": "0xc3869e8b73633d695da47bf47466c41a531a6eb6c1ff26fc3dd818bb79ef9b1b460996d5b8830292db9793ebefeee7f87ff64add7813083d27984de016221bf91c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}