{
  "manageEntity": {
    "action": "Save",
    "entityId": "1421072905",
    "entityType": "Track",
    "nonce": "0xdce1c12513e09d08f777b66ba60f4b236b0cabbd5cadcaad6c38d046e9bee8fc",
    "signature": "0x84ce40087c936d7d97eb3b11f27456a0ca6d74ee9ec669afa307243e2f1f464e7965174af4c2cb32db65b66de61438b9cc268197f95280fb13bf83a15fc61d101b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}