{
  "manageEntity": {
    "action": "Save",
    "entityId": "1666469057",
    "entityType": "Track",
    "nonce": "0x9ff17c8cab6d9c55452bb8ca0a9b041f82dc618b614fcf01453cb1c79c1381c0",
    "signature": "0xf9b1022dc0f2a0f03eb75bee0874485d7cb58ea2192eb8b5bc6ee6d33de0b93d53ea479bdc2edda4ad91a2bb850a47ca3f39872c8adf6a7305c39fb8a7acfb571c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}