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 0x96c535cc41fcec09923a292db5e23887d2a9a0e000712712da20cd7dc8aec388. 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/4e22e5ab-b273-400a-b267-35bbdeb56e63.json and https://artists.proofprofile.net/proofs/artist/4e22e5ab-b273-400a-b267-35bbdeb56e63.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 0xaf6b403238f7eb5a98091b1b1822de0f9cb8cea3e6e522cdb733cabc1daf91a4. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/GBLPF0107563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1e339e25de52c93e8e02ac82d25f320a7b7d1536364cb64a7563d3abe9ebad. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/GBLPF0600575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d22822779534af43162f1fa9c5d7b678d6595a31603220c9665e947b456448. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/GBLPF0129121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bf09f967f462a9902e867b73b83d751bc8ea3480acd87121ea214c6e921f9e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBLPF0607808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7272231259c944e0579301909a59cf26a2734c10fe09d443517a0a2f0dc3c68. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAER2025501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0af0dbf5f9dd46ad164200ec09bdbe91fd54a48658c9274d79b1b87e12d5fef. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/TCAFS2188657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67de812dbc4c6a10e2a83d5675b01c5540ec622d4035f9ff69dc93dc15483952. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAGC2239983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c8885138e2054f33fb1743094d37b72593813f6cbb6e5848c1086a0b17551b. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZMEN2382610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263da9805447350a45162876bf45639424d1b690fcfbba2c9031da549ec1aa28. 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/QZNWX2351996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea13fa57830c4d01b11eb2f6e5d8b6bc7f00cea8d9e0055b84703a8ae8699288. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/TCAIV2452324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c713be693337716f01b61f7bea0777220e76470491ffae311f109090c4a9e2. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAJC2486005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d42180f97b586d6e75146dd8f34890bcfe52ce47ba098340fff049002c7a3b. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAJJ2573458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3b006ae6efd1ebdac4a5c77a7c6d0e648dbd860a85ec0eab6f9083541487f2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAJU2519711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b17b71047fcf14670b6b920599b9fe153f9870fb9b3ab27edb668d9018dee0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT65X2599224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9816651aabdd9d0919301cce7a3e5b58c4bd28f52f5f84cfaaedcdf1ac1892cb. 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/QZNMT2149374.