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 0xbe3a1c1a5864d5e7b700e3ac4ae47042b8aea5af66926840d63ba91c867e4c7d. 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/0f6becb8-bfd9-4ab3-b930-b77e9eae8922.json and https://artists.proofprofile.net/proofs/artist/0f6becb8-bfd9-4ab3-b930-b77e9eae8922.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 0xd07b816dd556e399dde97f2558fa4cde85fab492ebdf71860b9c133995c9a0b3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHNB2133370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4041d48f68c0d67101761c7bae44c5da8eac366efbef31058aa6572d5ebcc05. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWT2114780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba424b8269c36f3ec79126e4c3b894cfe060311aea26a3007e3d470225d7bed9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHN32222257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce4b13e8e4a4b4fd42059870af1ae5c566824ee4804fe6f4cee80961e3549f7. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZK6G2282798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2fb831f4a497412aeb1856c5981ce03502368272bcf5e8ac8b26794e83990fa. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWT2219224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f0b844b958318e4861cf04ddee62efa75c0fe6d628de49151a4d35beb2f45e. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZNWT2216674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbacb5562ddb12ca45dd7e182eb057a0f455744f658cda448b5071817b87417. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZNMY2444099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6181da02cfc0456237beb4d34f9d7752314520afd5912cfc44e54af3db6da197. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZNMY2444100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1144e56e020b720e15076b9e3fddffb658fe7188d8b9170d874d2d12afa49e. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZNMY2444102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76491acef80f54bcc721967a83f3e8834911c1a806366f30b1faa9a84b35181. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZNMZ2482041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d61be403805357c5b35a0ae9f1b5cf7a740be1424b56db960baacfa90fcbcc. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZJG52560757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7709f0807d5f506a1c63bc4eecd8954d8a83eded0cc5e3714be73d5126e02865. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZMWW2552728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb48eaeda152661547e5d3eca85e013210a86a3ad5143a092d514e7ac56a9c81. 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/USUYG1535263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e7eb551eef0a3f3a5c41b79f8706e926f3910c1d7e7922add770159dc2e121. 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/USUYG1475715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e7eb551eef0a3f3a5c41b79f8706e926f3910c1d7e7922add770159dc2e121. 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/USUYG1475715.