Yu Xun-fa (俞遜發; January 8, 1946 – January 21, 2006) was a Chinese flutist who invented the wind instrument known as the koudi. Born in Shanghai, he popularized the art of the flute in Chinese culture
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11940fd4bef046e5781871ad226592d8255720d34dfe633e4da925edd2ddbb30. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb2e2b2c-a5cc-40ef-a992-6fad80b468d6.json and https://artists.proofprofile.net/proofs/artist/fb2e2b2c-a5cc-40ef-a992-6fad80b468d6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Master of Chinese Traditional Music: Dizi
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea11a5baad04a34dcf36ca75ef4cdbf179cf6fd08f8ce419512bc637c4bf9668. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CNE010444901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3ae1417b5679234e989e439d5c95b5ba6059153c30dfefd2dbe5b5dc365567. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CNE010444902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a157e7c468db8d487492c50e8a79f3c0e90e2e69dae3212022a592ac2d5864. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CNE010444904.
Delivering Public Grain with Horse Carts
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160e4a8db957d3a90f252d7288839047db0bab3b23125a23eee63e276109c501. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CNE010444906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d773bd5a938c5feddc066dbcd8c942c801e4396b8501bdc4568c41f9a8ac09. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CNE010444907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22dc119e7339c442e54f82ccd238d7b9a62fa9c993de857859ad9624debb3bfa. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CNE010444909.
The Yellow Emperor and the Pope - Part 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2e2365c6cd64a9fa7ec83a6ddab31ae573c721a88bed85230f990c88edb011. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA299500003.