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 0xec854b5cae32931c397866f7e70cb3d8072b095f86ceacb9792d9f6b737ee824. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/709010f7-6879-482d-8487-3cd4010274d4.json and https://artists.proofprofile.net/proofs/artist/709010f7-6879-482d-8487-3cd4010274d4.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 0x8ef57960eaee57ab1f219bc090c4da7ef22fb67d21f732c400e9447509d1dd83. 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/GBLFP2047159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8e7c1858a2c47b4b11714d0bea611fcf4a0712a6b16ebdb85872718d7defb9. 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/GBLFP2047155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0aff38c4ed806714d9f4cf936ea92c178ff375edafa7d92a097ab8662e1f6d. 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/US7VG2074675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6bcee26204a3e7c4a307e23fefcc33c0facc7bf04a58ef429f204a80e1f3bf. 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/QZ5AB2167100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca7aefc65d8ac40b63046fd21810d2e1800e09571495d7b6324debc098ba121. 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/QZHZ51901992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56d8bb99d011b8955d0cd7c7144a5b46ec38851d199dc66506b51f645ff054d. 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/QZTVM2385758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14df3e96e76f94508563ab75e1788455199bd1f3639688a7328556aedf65b303. 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/QZGLM1955777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cb74949cbb6be7f81f4a0fb8ad5287ef0693fb901f93eca7ac5a8331ce3070. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAEG1970442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bd91aff012539e56c24330a1771dee45db0758026d82f5acbe1eaf7df21e12. 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/TCAEJ1947990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe978f1c28c778ea4e4e655c7656e13e8fa593c9fcca49873f010cb4f72d6be52. 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/TCAET2027486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa74c1f9e9b613995e86d8c1e9420d0ff921cb629c6f3952f902506e27577bb. 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/TCAET2027569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7602acd4243e247b862a8f3903e7955b1c5aa3b6bc6c55d958b3a49c7051af09. 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/TCAET2027602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17063ee23f2e55aaff9eb3dc91194ca1bffc325b8f18e4aba785fc05ccd0dc3d. 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/TCAET2027664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61383229c2c0df7f356c453f5d930b1ba7e063976a539b92101f5ca89c0d3a4e. 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/TCADJ1701529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c021cdb96c316a2cb9bba4d38f8aeb569531307f0817413a5ed8b33bc36bdc. 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/TCADR1828451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81826a047e4fd12b54523741e7c75b080c6fcd2b3fe89be856acdb6b269c3195. 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/TCAET2027790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6ba3bc8309820e7336af51b9d7769b75a9f5864bc9d06220eff45964e34483. 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/TCAET2027891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5ad7c0d68480187886c437220355f02d1997ecb11a0d0893e2794f4f6b5585. 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/TCADS1801244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0169f8f28fa608564c6d9fcc459deb0ad8ad9416c4a63e27fe8f6fbdd0633539. 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/TCAET2027978.