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 0xde6f58f9998668b23cc3b5411de5ebb53bc2b1ff995eaf1b566dbbb0ac0e2f75. 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/66578541-451a-4bc9-af90-954c203379c5.json and https://artists.proofprofile.net/proofs/artist/66578541-451a-4bc9-af90-954c203379c5.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 0x8fa87871c27b3995b6155b5c61c04ed71fada8b885d2e32c0a3358b96d8b0047. 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/QZDA42249484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54364d68b13a45fd0ee3b3a07671a9270d487ff1e29c46c7f7dcfb224c8c96e. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZK6L2286666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a33188d241ffe54a812cd6afe06a160d431bb697afd81f0cf19dc726128407. 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/QZK6H2219976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f422e2610d3e92f3f7096cbdf53a85e5598e72c08353a5a261e0bee7cf35ea. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWZ2276377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa87871c27b3995b6155b5c61c04ed71fada8b885d2e32c0a3358b96d8b0047. 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/QZDA42249484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05869cd880ada72382cbe56a6012e1423cea45c12cd917bde7e8feee3b5413b1. 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/QZNWZ2276378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f815447a486a91c7d451dba8d5006c66118e622d4c4416253364d968930e3c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNWZ2276379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78180139e7c542d5b2437f3d1dcd5b306d7104d05087df1c3db0152c5b4e2238. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZNWZ2276380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a33188d241ffe54a812cd6afe06a160d431bb697afd81f0cf19dc726128407. 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/QZK6H2219976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ca6cccc843bd8127eb90e17664f1353b7b1731f04d72c9c14bdc766d47ec2c. 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/QZNWZ2276381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa65b0de85eedb8071e77020d032627b0e09e3e5ea10dfbcd8237e5aeff7e96. 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/QZNWZ2276382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54364d68b13a45fd0ee3b3a07671a9270d487ff1e29c46c7f7dcfb224c8c96e. 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/QZK6L2286666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77034219fc85f1137998f5fe08c9e13859dda1266806a13d2b91a93e8b0cae7c. 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/QZNWZ2276383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fadee45e5e90112ceeeb5a81050074953d1d8c0ea20226fe1f52de529d1f598. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWZ2276384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd45e6de0c52192f8ad410a32c1bf41c4d1d06c4bbf8436a63fb5a84fcc1154. 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/QZNWZ2276385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb93dc25a4446118e605d6ba31cd206f915f7f646de15d8579dc3e5442c2536. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZES92277362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f04ec7e8b2250e9a1c6b92cd73587b37b977fe3deaa667e276f31d0e58491f2. 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/QZNWZ2276386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650f86fe6820a2418b7bc8e74d5e862b8244b6b0cf4126cbbfda2445decf0f0d. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZNWZ2276387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe653b1596b28ed789a4ae86e1238007f2352da20b4dd990a4ad0438a4ed9e4. 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/QZK6G2476233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbaeae9f43bce850eaa81d5f4c1c6025a9af59869c32052e344b37650cc7f240. 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/QZTB42414574.