{
  "manageEntity": {
    "action": "Save",
    "entityId": "973131",
    "entityType": "Track",
    "nonce": "0xf2a3eeb8be2ee94544565e582f8c7007b5ee60da66ecca0480ed6373fdd8257b",
    "signature": "0x313e168f4aebdc874dea2dcbfe4d61bd4c7f3eb4884d498a20671ad9af881b5f3bfda1d103db66b04b5f6536ab7156a7b719b7def4e8a265adf6110a3c5e07911c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}