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 0xebadea72b04f7ca1fad78878b051f789f6d9d53d5b3706b57557c498f983fba3. 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/88043142-95b6-4ab1-a880-2a44d1259f65.json and https://artists.proofprofile.net/proofs/artist/88043142-95b6-4ab1-a880-2a44d1259f65.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 0x417da45036cdf0c5c36c6bc66ab870b676edbef8120382556cb1f1c2fe4458c1. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/BX5M82500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dffff0922f7178e8611cd24162e4b6000623826c1b3b013d6fb1d3485f19947. 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/BX5M82500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491a43ed8ef521433aadafcebe2c362a2d8bf2f76ca650068cfd50425c12b1b5. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/BX5M82500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ce5fa44f4cff368f479d1db4d5974bf9f2cfd16f19eaada98c17ee498f6630. 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/BCX8H2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca20b00fdd971eeb29274c20008a97ea0f292ece647ed5335548da1d1ae09a0. 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/QZW9K2391458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8045ab02a039d748dde3805cf915755b0b8c01338d796be18d86813df398e9cc. 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/QZW9L2454006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8a41b2002adf52eaa7f9d29ac7863ed81dfd98f3e07f4ef5759d2a29125a1e. 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/QZW9L2454007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2526e33ae1e7110640cd15f29e9bde8707a80e4bbf9201a51e5fda817c8a5161. 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/QZW9L2454008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d93fc1a1ecb80719c3c30d151f3e7e884e805107d01b586daef7bb199cf37f3. 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/QZW9L2454009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e10e85c7b43421c09119dd99d9dd43fab52efdf060fb9725500c66385d4541e. 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/QZW9L2454010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3989f32d344e550bee1c21b2bc0087b5690431001ed0c69fee6bfc9c469119a5. 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/QZW9L2454011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5d391fb2ab326e8a6a363660c304e20f5e9d303b6a90df1d78011f9df7d62c. 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/QZW9L2454012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c2ffa5853ca16c4b34df83417930eaee0ee721563fddf6b872f034f6af24ef. 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/BX5M82500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ddd30ace2f8b66ee4c865112778585c8516e81a6dd6d6bf03b3dc01f6986c4. 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/BX5M82500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1365fde4dc7b2d56ec2a26ce3f486d433cab6a9d9c5b19afd9fd20657a107e1. 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/BX5M82500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af81b1cffaaeee0c9ec2049cbea8a4e6956e0c72d26a3aa73df844713cb928c. 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/BX5M82500004.