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 0x9cbbacab76eec5482044a01f1132b6d599f9f1663e76b5b1787337ccbec52dc5. 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/af60b95e-670d-46ba-95b8-74238d4d3ede.json and https://artists.proofprofile.net/proofs/artist/af60b95e-670d-46ba-95b8-74238d4d3ede.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 0x6931f61914f7113bb1578ac5b6e20982ad3391925acd3e77b33986ede0707e61. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USHM92033404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e022a9a1c1dddf5cbd8764cb642b9fff7bfa6baa25eee067406a04351473a75. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:55:23Z), 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/USHM92033407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b2154d4510082c3ad829d42b56882dbc5456b8715465a8a74531f0f290b549. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/USHM92033398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fe54312af6b275a2d2989fdb862c96c329daca3a25f4c52f4ebae9e92dedfc. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/USHM92033410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c6cd8fcda5396648ae181d896eaadc5a25ecca54b02f94fcb967c9a2b8b223. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T16:07:48Z), 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/USHM92033412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f89593deb446b068dc0785bd257d3cceb9a966614eb0059421d73bbbd92d82a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USL4Q2018448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12782b0266adf99636f870249cb1b3413561283af9c5f12b4f7befffcc91279a. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/USL4Q2018459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e72c0fe7888c7bde689ea7199624fa662a4a76eb190a9501617debe994e795. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/USL4Q2018451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ceb43d93a43f3e8d22d3f29f1f29dce2b70a943d2a1c3a87211f3024ee4f6c9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USL4Q2018450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed566cc726332e0185a0b3e3c05b83030dfbe29227b0f74d04786c67fc83452a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-27T13:27:00Z), 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/GBWUL2421928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadaa5ceb81ad5b484b423b392023c6e15b41a9f7d3a7a40b5845578e5ae929ba. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/GBWUL2421941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f89593deb446b068dc0785bd257d3cceb9a966614eb0059421d73bbbd92d82a. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:39:38Z), 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/USL4Q2018448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db09997c51dd09ea68ce8f802e8a31632548b68f2380081269df0ced6d2d55a. 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/GBWUL2422242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db09997c51dd09ea68ce8f802e8a31632548b68f2380081269df0ced6d2d55a. 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/GBWUL2422242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x785d3d795cc346e4037f04666d06e9f0485b11c29c08dac992fd9dc0235723a2. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/GBWUL2422257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa3cff24bd760dcc58fb31750d5ccb203a40c89eefbac210304fd93e306e275. Chain 2 (Bitcoin): anchored in block 958124 (2026-07-15T11:03:05Z), 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/GBWUL2422259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527d60443508b797b91815a76d0033f6e4e0e36a6a67b1d8ac31da9025927234. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBWUL2422263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971bc574282da74855616f8e140451359fa7243160a1e73abfc65ce43e211d18. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:42:54Z), 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/GBWUL2422264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723b397c474110e8a7020e6f7843bf9e9b5c4e196937038b84e59c977eead662. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBWUL2422235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c6cbf43183a8a8cae3e9474a152365a3bd0c3a8a3bfe38254208b0beb1a8f8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTRX2495380.