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 0x1428cd97b8a3619448116c7410890739296933ed9a766662791e6b2d42e30b9a. 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/8a4d86ce-bcd4-4e92-ac26-612dda1096c7.json and https://artists.proofprofile.net/proofs/artist/8a4d86ce-bcd4-4e92-ac26-612dda1096c7.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 0x623114e253052772b007b26383e04f62744811d3045cffbace3a78d4f8616720. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZHN72112296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e6c031e554c455474d04d04755ce9852c22c585b334f0c46187df3e8b225a2. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QZHN72112297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36cb411320805db3113c6549a36d5d08ee996a10587c8a6fc69cda9b6019c3e8. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/QZHN72112298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f7690b2cf3698035a2d7fe70940e008102bad6a9cc07d37dbda152e31754dd. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZHN72112299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d43cb375e19cf1ee559159944bee40cb3cdc1c6f1e4c4a5ecea9085c62f08c1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHN72112300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d58e85f0e67e48b5d512ba566ac6617aaeb4c75cb44375d7d716d0b2fd9d0e7. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZPLS2481339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98014feacdb07807c9c54f5cbae1bf6bf9cc08c4505c0e9d132d13a213be8b7. 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/INT202404474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ef1cac49a2b301d9d64f4abf85ffdc108dcae97132f6799bcf74d1dde5b750. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/INR832302151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6c9642f719f6cd5f86b5389fc35cfed21673449fd564855871d9681cc89549. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN92113725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ecb8fd2211e96982c85da485c441a390d2dc402d21da8c49c66338811ada02. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/INR831900045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ef1cac49a2b301d9d64f4abf85ffdc108dcae97132f6799bcf74d1dde5b750. 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/INR832302151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05bff8aa4aaa2e487ebd608ad338bde1f9fb065c3626d431c331b5a497673155. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZ5FN2130272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951f6edfa5676d888f0eb74dfda897c8826eb129947a152282a567718fcd0b07. 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/INS172500772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4178dda006090fb9e2edece18637243082731caad8af5b54a97c93bd1227ab. 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/INS172412099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc847992913832a30c8581bb6f9d47dc050c78460591817a038810268acb08e9. 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/ES71G2303015.