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 0x6fc2ff8037c6be6fc6488032727353028705cd6bb2b4089b23d0990baf0ddd40. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dd18c2f3-49fd-4e9f-a898-6863752cbc4a.json and https://artists.proofprofile.net/proofs/artist/dd18c2f3-49fd-4e9f-a898-6863752cbc4a.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 0x3d714e709e7e7b593baa8f7b9c1264f347fc49816dc4f2869bc572d027c9b595. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZK6N2413969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd76ce7effa287a0d64e4ad75468052add135cedd70e5d979beed02961e7e73. 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/QZK6N2413971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7768fc6ca34d441c61b09164bcbb92b9f87595b4f0b45136ce059166a8ee3853. 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/QZMEQ2418811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ab25b4cbffd33e3fedb97f5552d2e58db5df171a8ce231d63d4c02a5bdf3ac. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/USLD91768013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc91325f9e1ee9961c26d30933fd0f0dc1f1f3e60700beb61c116a4cbaf9a4a. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USLD91769609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7574840e217aab2839f7b4a525234d5c9c592795ba67bfa1b7b11c0e1cb4dee. 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/USLD91771329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc16ce4a4374b52881544e7fadf730b74b718371a9c1357dfdb2dd69ab42a21. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/USLD91771330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b4dab54dd794df7d7bdb33629b7b2ad4468e8a0b44e7330298ed31b9a8c922. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/USLD91771333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a30b790e50b8937279228e3b3eb489deb843fd2f8504e5411cf9492b048cc90. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USLD91772746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11472cf088280af4bcf799f999fbe510ee8ff60cc24efb7ae385f400125779a4. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/USLD91773462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7402652c55f860c56b4ed2db063ee09d608170a1b88b3dc0be9107d06d92bddd. 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/USLD91776063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df24c8aed6d1913ba3e7b7b287678ae55b1c39dc2f4e0b979d64f4061e5666f. 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/USLD91775920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0419f9424246dc0f0374fc52fa810c0895a1fe3ba904d9a9ff83739058ee022. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USLD91778933.