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 0x2f278208990b2c4d2757feef18c2e4ab906592b98ab6aa425a8750864e985e54. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e251397c-5533-4de7-88c5-ba6727446507.json and https://artists.proofprofile.net/proofs/artist/e251397c-5533-4de7-88c5-ba6727446507.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 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 0xb76a5d371f587d1049be1610032ae16590123943f71a65a0686e39f8a02700e2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CHUM72400085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5019b742b891e4807094a6800b994399fa0045e6c7a79d4b9e0ea22c887216. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CHUM72400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea93594b82a7f452abc27cbc9195c61e3f025e44e3ad1d86e130c0e35740ca7. 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/CHUM72400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea93594b82a7f452abc27cbc9195c61e3f025e44e3ad1d86e130c0e35740ca7. 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/CHUM72400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf9ae2841ff0ad9a752485fae80944c37a11412481d9f93e1007a963dc8659d. 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/GBKQU2225293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498f6772ab175f3c08a9a35e6499df6ecc06ccd70774277bda0a16c50a2fd093. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/GBKQU2225294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f3f9e1f7179bae63489cc717b9ba5907faf9f3a49cbef1c4a1070d217d3af9. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/GBKQU2155394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33e64d6924ad4e98c9578926bcbc683b1482a2d4f9592eab3b7b793760d8b5e. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/GBKQU2132811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf1a38816d78c55e07be689b651ebaeaad0d8bd576a485c1e1a77bf06fefcb6. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBKQU2132812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc850048a52e9de9d1cd28c869584f7ffe8f7c0abeca9179d3dc1911a2b25bba. 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/GBKQU2128743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6ba48d6a9e5e19fd9d0978ba7b38b0da3aac4afe33a203956ef8c365d67a55. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CA5KR2097072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1b348161bc3d8662e5f628bfb67db8977a59b0ff1fd1e9221b9413e04e1c44. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZ5FN2041691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d003b08688588beaa15fd793a0a708f5567f1463d5174f347a18b5076a8b47. 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/GBKQU2059363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51a138084639d6a25d67d913efb887f166afeaf72a4e8bb528d3d489bea09e7. 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/GBPQS2000118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d7ef2877dc1ed6d71b13f7bd9598591e72aca5c07764eb5363b69fed321922. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBPQS2000062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7954697e22e45e412ea2632b60a98d98be640289eb60364ff269e3a90252298. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/GBPQS2000059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6c62452463ff4f1aeb1ef6997c7164721dbc36a1bd81f76e592b0e80d9e2be. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBLV61513937.