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 0x6340f804cb602e9bcf04efe15288a47e3ef0cd4ce7ecd1a6033ec25575c7d8e2. 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/36e110f6-23a9-444c-8c5e-2016b524034c.json and https://artists.proofprofile.net/proofs/artist/36e110f6-23a9-444c-8c5e-2016b524034c.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 0xde4e244dbf73b6bdbaf2fe7146f36e48c673aea6c2d1c60e96eab87f27aedfe1. 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/SE30H1505906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd8698028e8205bf4d09d8834b6b330905600027ba2ff397712ab2a5af0a0c0. 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/SE30H1505908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a05e84d98b3b8464e6b0e3e259521c410375b9ef214ab48999ebe9fa598f32. 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/SE30H1505909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1a097182adb414356e3eac52dca7b90d2eb33dcf4917fc59b6282e95bed6a0. 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/SE30H1505910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a0a8452cc8c099356ac6b9eb7584c79415807159983e95da0b3e3ac2057675. 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/SE30H1505911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044546a8bb638916a1b8d2a5b175d64ae8499fca5e54cbe4a30898ca7da947f6. 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/SE30H1505913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f59db6f604bb3fb65e009af42a79bc8a49b689acd7af89ff8b330ade196da81. 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/SE30H1505914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010a79df8ed5e984db794a185b037255e331bff0b9b2f5266ee1d189718af3d5. 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/SE30H1505915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde155d3e84d0a1cfc70777d4a1b1156cf3b11411440028cabfa5c065c4b4dc6. 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/SE30H1615519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x307ff2e81205bd62bf90f75c669275ceb7361546ca40586f19a3c6540390e167. 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/SE30H1615522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d91f8bb1f4ef69294c340916b7617dd4301d9a63d53bec7aa0dc9496869ef00. 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/SE30H1615516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc069fad1521f501a5043753f3872721c93aa2e59cc7837348860cbfff0d9bd0. 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/SE30H1615528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078ed472e2aff6ad8e03af299903f2c400ef90af07ae06ed83194b84c858d9ab. 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/SE30H1450589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa76407413b6d668171404777bf0b476040ec7738a03bc3a074b26fe35c2d98. 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/NLS6R1847941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7c2e7e700a8f2704a9499aeeddee20a9fc5dad6d68def74d71543ef1c402cb. 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/NL4NL2011172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfede59fa07017a648c6d449f079702134546cb7482c43eb5f84b51af20cf911e. 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/NL4NL2011173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3435fc946ef19800239e04dd951e05685d8899f408fb9d4ece4c4c1a727802a. 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/QZZ7Q2401185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6046e3e75e360c011fa9119229c02494a18ec9cc3218cf96208dcdcd02fddc22. 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/QZNWR2297535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461b752a76578b84e01b324c540686b8d04fffe9a29f23583ab1e3de8c21c4f5. 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/SE30H1415028.