{
  "manageEntity": {
    "action": "Save",
    "entityId": "2129252154",
    "entityType": "Track",
    "nonce": "0xa2ecb6cd2d322f33c60b3f9b65ec675c851d36236f27fd794368fd4f0fd9c094",
    "signature": "0x1b2067ae9520f68672ee0917f460bb9c9a0eb693b6dad66be726a61a8eff7ba82beaf330b9e597841985239f6e57cd152122321da54436e2697e788efdb8c7101b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}