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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bdef9bd53fe96299e334c0eb45c42371c39963965235687bf079abc229ecdb. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05795347-328a-466b-ab45-fe63c2a2b48e.json and https://artists.proofprofile.net/proofs/artist/05795347-328a-466b-ab45-fe63c2a2b48e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schola Cantorum: Sandvold - Nystedt - Jennefelt - Sæverud
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b04aaf2e152b7c4d53ab2b270530b6d1834124c6f8efbb8acf20f4fb9f86c6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOMPL9618060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b56ad7395463bdecd4551cec656e551a481de5e06b1595d6a3ad85510978e56. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOMPL9618070.
Fem Latinske Kirkekor: 1. Jubilate Deo Omnis Terra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e6b957a66add9976b74595b607329151063b330e8990659255fae7772301e3. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:04:55Z), 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/NOMPL9618010.
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
Fem Latinske Kirkekor: 2. Tantum Ergo Sacramentum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5397461cbddb3fe87fba5eb4bbfb0e38bba94a4c7b2f239be197d2a1c17c3c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NOMPL9618020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb572b544c44f9da026cfa17d7c42dece91e5eac84c71762f54da40bd5ab9b4e3. 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/NOMPL9618030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb508900feb6c77e63d34204a1c9a5475d0a23f4b9204b31c77e52c043e687b9. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NOMPL9618080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56714bfa75b5f0fad5c731f6eddd9110dbb6b37262f7c13760ab086644c610ea. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NOMPL9618100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83788bee5cc5631c5aa9cbfb57176e5309f953211770bee4149a64bd6627327. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NOMPL9618120.