{
  "manageEntity": {
    "action": "Save",
    "entityId": "340050275",
    "entityType": "Track",
    "nonce": "0x6f840a6544460875dff8eb40a6fb63b9bd7647530d54393cda4f7c319c8b8840",
    "signature": "0xa45b53131f4c23530d499f077e93540fe225277930420931773503dc4eed95cc073e8b4840a5914484c09dcb0e243ea4a3e4d22d4827f03d5d35a5e3e1e1a3941c",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}