{
  "manageEntity": {
    "action": "Save",
    "entityId": "311478844",
    "entityType": "Track",
    "nonce": "0x71502ee58666fe99ba5b4b607088bc148163c019f331b43272f49c9c68111f9b",
    "signature": "0x7a14f336c61ad8914283b3e1e3f4b01c75208be614497874991e15092b39e06e4b6ea09ced9dc910e103f10b73a90882c4b70a5c730b1ba6ef61c2df6ade6e171c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}