{
  "manageEntity": {
    "action": "Save",
    "entityId": "650609722",
    "entityType": "Track",
    "nonce": "0xcf565af842354ebef02b120d8446c3df03e33bcb30753591a1a58fc3e25a1162",
    "signature": "0xa44095960b006065d3b2e1a765b601cf4721811614028d73b9fdca830abb28b7649466bf5a177d2e3d3ee04e7562c5c316ddf83be127e805d670bed4f0f1e4e41b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}