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 0xbce09195ebd79b2aad9f412bc07bf009bcce35ca215379a49cb439069440b0f2. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe4c2761-1fb9-417d-895b-57bec1a4fc06.json and https://artists.proofprofile.net/proofs/artist/fe4c2761-1fb9-417d-895b-57bec1a4fc06.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 0xfef9714786486631420d0ab67b8ae8ef92d7f0f771c60dbc3f86a3ec075de602. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DKEP31701012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7823612fd2bad2c5d2e63c7366d95e4dfe02baeacaf1535680caaf125650b207. 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/DKEP31500104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d134cd708036fbe7ec8b397990e03201ed6cf003703c4ea2e0c324428f66af7. 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/DKEP31500107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98d30c02a39deaec3b15493fe259b6f28cdba2d04fd4712d4f330d74053083d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DKEP31500117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f1ce22aedbd1b1bde550b2cf1e3ae27d1809f9e26a09aa78396e967e00d1be. 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/DKEP31300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707fa8dd3ba2be1719db47ddab60fdb336b54aecfba89f11709f5dc17d674fb7. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/DKEP31300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa532d2b623b3ba623747a75bcfb31da7c32d12def05eeba24dfbb13646265f27. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QM4TW1927001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c0e98aa90eecff1962bb602c90a9f620a6e779212615a70e0610425faf6701. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QM4TW1927002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b6598749a7b17e5a302c7c81a2cd6dcf4aac65fa86b2248b353d8a9f9ed128. 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/DKEP31000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c674d3552a0f8cc59301cc6340740d3cdc9eda199c5809c7388d039202cccb8. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DKEP31000127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7edd846c552db5375850fd204a26ab4fe1f103f3caf73aafb6a94a76472ffa6. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DKEP30900206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5c5ec3bce8a5e9e2d144362bdf3126e1b2ef52e8ccaaae3c1d9ea5397a10ff. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QM4TW1921975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f071ad81666c2f8ddec9657349052525f3d1e12efd816f49a1ad722dfa3e6e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DKEP39300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae948b79804922a07300078e890375e0bac6ea4b35e7a1724f8c0c034cdbb520. 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/DKEP38600102.