{
  "manageEntity": {
    "action": "Save",
    "entityId": "978015453",
    "entityType": "Track",
    "nonce": "0x23ede8d1af88c2c12089468b50719b558ceb8e50ee846367b7cc40d4f82d20a9",
    "signature": "0xe9bd1c7d36b843f00b35c0850fc99313febb159758388af6e5c7c706b963f77f735fc1ee419b67ca75464775397b2b6f992534af60685869fdbeef5a335e03ee1c",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}