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 0x152a3134099872c64ad18dc3a6f781aea31764987e5c4bd0b8152cfec8f3d21b. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/843167e6-5f9c-47ff-8b74-0e36905542b1.json and https://artists.proofprofile.net/proofs/artist/843167e6-5f9c-47ff-8b74-0e36905542b1.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 0x90e6b8ef11e95a6ae68d287d4ca19126346f00224e28044dbecc50d60dec29b8. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USDY41950648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c0ea95c1c5d38774d8f3f2a41f0f505e8eba319d6a295579247c22eb0d4168. 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/USDY41950649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cbb311730ac29afec25381e3cf5bd3e53c36932111d16f07fc7663765e3e4b0. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/USDY41950651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4ae1d9cba7d955a1619b9ef99950e32ba51622324acca755c88babb8e8ddda. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/USDY41950654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6105af8247717ab31bb951880e56260cfcef9cf26ddd48b9009c9069b1fe6fa8. 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/USHM81575188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a89645f74fed03b250633d4713be213a38d573e360a4bddf22b35467f69f4aa. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/USHM81575190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f3b4fd376c211cc156b9d352754456bd3c37bcae31ce017204c4efb285b2b1. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USHM81575192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6f3f3b9b13a1f30792c9ed1dd8735e1a55e823ab7931c9e5c518dc6f04c17b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USHM81575193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880ce310f8013bd65f717ed812cab46c018c7e24abde1001b618b00d5204ed6a. 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/USHM81575194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0724c05d2d2b2f98ef4badc628ff65c3cd30fe65b80a30d21231bdb043b5c04d. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USHM81575197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6260c78aa98ab20fd37fd3830ced3105110de4079e54751a66b0f04be7661d4. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USHM81575198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dea60ac404367b6ea5f133e98a716cdfee3dfe33effd9e71bcdfe43e518a69e. 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/USHM81575199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6815995d8a0ede94a36f3dae7d59e1d189e5c81e071ee1c2e278aa8bf4ed652e. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USHM81322440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa548244c268b179f55a11222f7718553ad9eddaafef34bbe39cae87b203e24. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USHM81322441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6e7d78919e4e929749cde343c52adb6c1cfaaeb3ef697e5d4c261c29c777be. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USHM81322442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17de4a6bf782fb03fcd47ba337fe7263fce2d0c84d42d40f9d0b24193fa1beef. 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/USHM81322443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db6f75a7658f3b73ba0fc8d1438143f6d13a081a5aeb5f6a5e1b55297737abd. 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/USHM81322444.