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 0xedd81886ff23983675fc18d4602384ba554b786d846e744c728954cd8d82086a. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21c666d5-a9d5-4aeb-b0e7-0e1b0e71de06.json and https://artists.proofprofile.net/proofs/artist/21c666d5-a9d5-4aeb-b0e7-0e1b0e71de06.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Delibes: Lakmé, Act 1: Duo des fleurs (Transcr. Ducros for Cello Ensemble)
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 0x3adc80b4c3bc1da6a807c1b5c3d012cbb715e47755830d74648a6c5b97536b0d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBAYC2202463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f7e7c297eb1954f38946ccd924fe2e297feb0c1964c4e0aa76247944854136. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/GBAYC2202458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba8642259e94a6ab164358e35b8dabd765e5208ddcef94cca5c3b6b31ac26c7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBAYC2202457.
Djawadi: Main Theme (From "Game of Thrones")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8f9fb0530cc72e5bfacb10f0279901d1c9e3a9802d965f84d270fb1f190b58. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBAYC2202461.
League of Legends: League of Legends: 2019 World Championship Theme
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x416d46d5ac0671b2b16086a49fb26743e51a384197c0d0fc28ff995796b39167. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBAYC2202460.
Piazzolla: Suite del Ángel: III. Muerte del Ángel (Transcr. Walnier for Cello Ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4b83302de56a8444eb86c8474493ad29e0b622a0f461102e4a5146b28d7486. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GBAYC2200179.
Bacharach: South American Getaway (From "Butch Cassidy and Billy the Kid")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6192e930b9990ea20dbee87854b59ca4d7f636d9a1d06d43c08f79b01d78e4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBAYC2200180.
Ravel: Boléro, M. 81 (Transcr. Ducros for Cello Ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08616f6494628e9b80ff2b4c8118eff771e97f28c0ad2625f58eaf6028596879. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBAYC2200181.
Sarasate: Carmen Fantasy, Op. 25 (Transcr. Thomas-Mifune for Cello Ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91f6ec8247e29799c6ca4393747f93fcfd3ee3ad9d5a8ef7f0b948aadb65aeb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBAYC2202462.
Bartók: Romanian Folk Dances, Sz. 56 (Transcr. Zirbo for Cello Ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x737fdb6fed5e708d629485d1c8b888c9c0ca65207197a029dded9da9fe59f157. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/GBAYC2202465.
Johann Strauss II, Strauss J: Pizzicato-Polka (Transcr. Seymour for Cello Ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb894370b191366ad0a02362fc6e329437aa2ab616a0eb2cb93291c50d22d94c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBAYC2202459.
Tchaikovsky: The Nutcracker, Op. 71, Act 2: No. 13, Waltz of the Flowers (Transcr. Parent for Cello Ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedba8075cba7348e0b179b157ac19934f03c04d7d283919bc97b419d1daf3c82. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBAYC2202464.
Dessner: The Forest (After Pérotin's Sederunt principes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0ddc3cd0e182145d75cee98ef2407a08c4afa62b207707105ea276b715ae72. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/GBAYC2400817.