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 0xef5fbfc156eb5d2f29ee343cafb2a9434d4feb254123491b129292295688e1d6. 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/8074ed44-6aea-4551-81d3-7ad786e2aa8f.json and https://artists.proofprofile.net/proofs/artist/8074ed44-6aea-4551-81d3-7ad786e2aa8f.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 0x0863da689b24086b9fcecb3c592c83fea66c34357ff8abc6ce38b3166e42273d. 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/HUA180910601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e1c37b413c526afc6e76f889e56699e13f59e9d77c95aaaf5fee190aafdc2b. 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/HUA180910602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e13ff80aa8ae33ff8ad1e67fc409a33dd1920c5b1871020026bfb9c77de055. 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/HUA180910603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3d873344b5722181814f88b63712cd6f9a6f78caf4798d4b883287eaaf720e. 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/HUA180910604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054c754ee3881306b1b4f5a40c0a596bf0c1811d714ca55f22e14bd3cce1f3f8. 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/HUA180910605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefaa4c7ced994067ed760d8401185841320fe9fe7e9ad0ff395e1a9d017a27d4. 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/HUA180910606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30ebedd26fd32f9b4c726c95b4374cf7ef88dcaafdf4661156458b2db4e102a. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/HUA180910607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f770a53e8b3a9565b794dba27a46c732ce1185cfb3827d0a79e9dc1084e7dd. 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/HUA180910608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02335b6dce9be332e0de3e407bef29c314fcb654ff34b4deea6a7b968135db9b. 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/HUA180910609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68bde7bb7cd8397595ad54eaeb5f7d019b175b701d6f92f0814006061aabce8. 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/HUA180910610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8605a4a45f181ea067b6d51d399fcf1434919cfc22a98fc61b060726e280e16f. 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/HUA180910701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ca25aefb0a843a6b4dd4e3b25c757a417467183754097d14ada5af9abd3e6c. 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/HUA180910702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd0a5abc18b9841398f86b58eca7b457853e12cb02773708125b5c2740bfc7c. 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/HUA180910703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0bf8f5ef73a3c1aca5cadc17da78251fcc51a06adb7a6467ae68b1877c294d. 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/HUA180910704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326876ff5a3cd48c5574f876840c1b91490da7779b9e45909302e2bc6ba5a96e. 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/HUA180910705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3b5a97408d390e8d966d30c6fec0d976ec2e0dbd01a04b63a08fe05510c75a. 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/HUA180910706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309bd451cb06c2cb77469a2ec0ceec840d4db6d60685bfce7109f85a21174917. 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/HUA180910707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6deb848b81c640e52a75d02677aa9db74e0e05230bd44f0561709c0724adcf. 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/HUA180910708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d5d55795fd3162ed8902aefb0df9544d82b0d4d1d95dc334126c1332849527. 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/HUA180910709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac736f30954cc5329280387d5140bfa69e9f87638afa22bd75e96de15ebccc6. 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/HUA180910710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d349bd0b27c6bdf2fd92c02b8a47f4b4f88d9b5f03e98bf6a46a3d95166593a. 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/HUA180910711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f209279577f9aa7a59635de23ba0b8887608f568016bb59de01decc92a12428. 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/HUAC60600528.