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 0xb038d686cd80b1b9a6e9c09954572b41fe9f629bdb52e9e9091f5c0b54eaee70. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c5713743-d7c2-4371-a805-4d0a757a08f8.json and https://artists.proofprofile.net/proofs/artist/c5713743-d7c2-4371-a805-4d0a757a08f8.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 0xd16ba17b40a232971df3f46274f87314c60cb69e7be15d81f0fd152495a9ff76. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZMZ92350161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e032bf3c031c856eb27289a427980c08f3eefca50a9beb000d3c0d34d6912e. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZMZ92350162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a049eae507a32b1a636a008b175b0f5293a8283f097dc822de63f6537b1d3cd. 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/QZMZ92350163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1ed45d5d435268b57448da4915ec79f63d8764d78ee2bcb23c5363cbc79093. 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/QZMZ92350164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1fe2913ef3f1d0359ffec33f76062bd25418ec700997b59b9ff803e279fe345. 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/QMBZ92002910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac667f552b0217722ec2b61ca6a2bf7f38c03fca517fefb46ec573fa5a8800d7. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QMBZ92002911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde37c386cc1b0f0ca6adcf3d9209847bd80f3e03b5e97fd97a65651b287129f3. 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/QMBZ92002912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ac0283fb864f2180e21d3c59c75a0abdef24104a38eb76b83f92a267440f19. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/QMBZ92002913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf74b3e1b7123ec7f5bed6375d8c144fa16a047cfa0f724f106b52b92dae99a. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/QMBZ92002914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf191833ec165ab4a18a0b53709523b30597a8069e71f9d591661ff5e32f552a4. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QMBZ92002915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783d15e5cf3c98e6d559f19094c4d3c36c264e7116faf85274c2692f744aa51a. 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/QMBZ92002916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66abfdc725b67b3fd770f3619e9b3f0876dab60f38790080aba22ffaa65a7bd0. 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/QMBZ92002917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481a708b4b5a804b8707d7aaf8eaceaaeff997249753c9cb997b8a34ff9e132b. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QMBZ92002904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729ea939b80d16c0ce51b0fb263a3ae838a2dcb088b9a19eed4321b69acc338b. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QMBZ92002905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c4423fea28205091792b90124a5693d336380008893a9c624067b525642e05. 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/QMBZ92002906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0be5ccd52ca2bbb1f97825a3ad637fc1d6881dd1502c5902761b9c83e88777. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNJX2325655.