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 0x6ccd1b5a26d2a9d5b0c627b7278ecc0022b0377643ff8f17a36f3b972b7f1501. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/961dad37-fdfb-420f-9091-3d664063a314.json and https://artists.proofprofile.net/proofs/artist/961dad37-fdfb-420f-9091-3d664063a314.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x0e1e7078551e5cbf4cb1675b4e47164e1b4629486b0b7269f53d2bd1f3ba9dbe. 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/NLL6R1700756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926bf05c9339a15b24f3fab3639048226d2a634975e5af840fd5d12e8419bc81. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NLL6R1700750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ddc8674d39f2e9a624b5cad57ecba048895391c779b7c8db0b2094054d30aec. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/NLL6R1700749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28dc43295db89033a28da72795084970527f160ee9c16a3c2da58e60fc8a1d4. 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/NLL6R1700762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab4f1dcc2caa90a949dbd8e435a829bee74145fd3f1a91f8d1e7dbfd71a69cd6. 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/NLL6R1900503.
Händel: Organ Concerto in G Minor, HWV 310: IV. Gavotte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ec50c7cd22ab6f1761da953404899ea5f8aec3073e5a132a49f4e4f4249eb1. 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/NLL6R1900504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c76b5a7baef94af3b2190e0c0c6d417603adc1d36653b47d19adf848fc70e7. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLL6R1900505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe595318e233320cfdb0c5a67b6aa5e4ae94cfa7f866d41c65c0f33146dafe224. 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/NLL6R1900506.
Popp: Sandmännchen: Humoreske für Flöte und Klavier, Op. 471, No. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b8f39f8193bec80f3b1b784e21ff5ebf74c26e6b86482a1d7fceb6be9f9cea. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLL6R1900511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc0b5d202969a2071abc2ae43d721ec1553ddf3cff1facba70550a8ed40e59c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLL6R1900514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb97c7d1c988ffc7f85fe7dc826b5d0eb9ae1c6f957ea1db80c2207e285a4f8c. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NLL6R1700754.
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 0x5ba5adef5ecc309ba657599d563ce3a196b3d538ecdaacada30f18a0add53ac5. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLL6R1700758.
Gossec: Le triomphe de la République, RH 618: Tambourin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbaebb5d0e27d843687e396cc5cfbe4a1724562cd5c495b6ac29fc1fbb892882. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLL6R1900502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x663f1caa8238ba51cb8f3c8cf96f6e55729a7cb601e09e05f9d557aa6861537f. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/NLL6R1900507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698540ee54d413b3e016f0619c6d797fc97f5fc33294b707b244eeb108337e10. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLL6R1900508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4150b7141940a5b6faffc9fb1dfd5475a675526c88247d29de2d9a82c0296ad. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/NLL6R1900515.