{
  "manageEntity": {
    "action": "Save",
    "entityId": "857899157",
    "entityType": "Track",
    "nonce": "0x772d6290339aa6c103981190ccad577fa7d0fea1ba4b795cc67e2d32e2e7009e",
    "signature": "0xd399a05f4b4b4bb9bd7e51b4f792336646104f856a532e1703e368dd15d78f7664d26405be377b1021563b48f50c5f74fb3df7ed50912c6fceb74793f14400151c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}