{
  "manageEntity": {
    "action": "Save",
    "entityId": "661977085",
    "entityType": "Track",
    "nonce": "0x90d1a879075113318463d4ceda61f3681ebb42854a30e58e2a50099fe2f2a9a6",
    "signature": "0xa19102d0f96d1276e4ce4078fc7184db2c743cd295cc2378563229d9efd2963c6d53832280170568d05be193213ea2f7115676a6bb33b2a655ab28d6d78368001b",
    "signer": "0xBBBE9eFc177a4E708d317195Fa81aA6E8E2F7E92",
    "userId": "557135181"
  }
}