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 0x5231fd674db72d10ef9448bc6a3cc7f98db29f0a310acbe41ea83264d185372e. 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/4cc9596a-8f1b-4142-94c0-32fc545cacdb.json and https://artists.proofprofile.net/proofs/artist/4cc9596a-8f1b-4142-94c0-32fc545cacdb.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 0x480306047ba6048a02cc852453d531c57b1969387b0017e4ba1249ce4a7e0438. 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/QZMEM2080450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8fe04780d054c717bd6806e85ebb6101a6144336e6b49eee2c2418461f4f9d5. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/QZHN72066939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfabdb43b8da51fa4e4ed82e54254702613c469e074a7be2cc0fe9f26a5b0b743. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZK6M2065866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608aa733054677a632d5ac12c3d7775206b120834ae81557e8d53d0355bfe700. 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/QZHNB2094193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb798ddf02fe527f8e6b7504f0f6838bc641d552fd79297bcafe2e29ede364cd1. 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/QZMEM2080452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3095753486ec8da608476b8cb71087b14c8c13520fc78b06f4c183ebd3f1b157. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZMEM2080453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d295b7fbdbea0b083cb36526a7ba5bb3c39b5701f97f4dec7025e97ceb59fa. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/US7QT2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7f4da95ef57beb71df44c659f916d3182db8bfe2d88d5ef72cf13ce7bce529. 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/US7QT2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d295b7fbdbea0b083cb36526a7ba5bb3c39b5701f97f4dec7025e97ceb59fa. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/US7QT2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bb636d6503e9bebfaf87aef3f6b8ed2ff248b05286e4d14f686e48b9aa31f90. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/US7QT2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c7f1678f046ca99c58ceb51571dd2e8e60c26e9f59ddcb1e7dc6e9307d9010. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/US7QT2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09749652c8bb60288d5967ed58fbc7e7db3e8011a1d563faedd03435ac034b39. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/US7QT2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd752ead9f899bf965f44ad7313ad782050de33183f70527a4d901bef84d30d20. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/US7QT2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e21a0b9fb6171fe70d7f52b03d7ac1ea748b7f40ee08941187f1f2f45762882. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/US7QT2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7da9bfda91742fbfd3748db1e6fccac1b35c11e14e12ad694616bd057942a8. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBWMY2050850.