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 0x952dd7e4353ffd0a4e57ccfe40b7e76801fed3b75988dd45aab7f73bbea5f992. 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/83c298bf-0ad1-40e1-b37a-945fba37d30a.json and https://artists.proofprofile.net/proofs/artist/83c298bf-0ad1-40e1-b37a-945fba37d30a.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 0x79ec51dbefbf3a113a475e46b5bac00525de94bf13b26a749f6c29aa0c09523d. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZDA61886290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81071d090fe3a8466434e85995b27cd2ae6108ffcb950499ddededad13a7e390. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QM2PV1813515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f60a033f87a9220c98708d7063e04829a485420cbbbbb6cf3831d3e64d7c5a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZES71892863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9481cd490381cfcfe64478af8bad636bfb24cb4ee04c00eae187feed3d05a4. 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/QZFZ31945535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20691c54c6bef2ce90a8af45e3f6566dc14bf9b2b1315ec45163c18b79536d7b. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZHN31971096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db8a844c439047992c1ddea1778bfaf4ec1834cf91d75e4de71a533eebaa678. 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/QZWDW2383848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf624e9815da445c53d81c68dc9b155aa7dfdc1b1778d41e8bc006870f03bac22. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZNWS2015121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cd7abd66aab6275f616df783fc2e067b6a44a4d4d094c0620211b9a69a3afe. 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/QZWDW2386601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53f2f938bf59450cb01fbb1589500981b7493c41fae8b5a0fd4dab2319b7e65. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-21T22:56:27Z), 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/QM3DF2136886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942a2f3fb2576e20fc5c1399c60fc96e0a897539a7a271eba1ffc48971d8f2bd. 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/QM3DF2135825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd502f647d36d8991529a7559dbac9bec0c7a61a70e7ef1b5ecf71e26362b9e. 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/QZZ662313848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b32fc59c8846c50ce3e792cdd9c334ba010ca542cb3f466c9f7235178ce840a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZZ662351139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ed744df2f7e1cc4b6c21084193875740dd41b5c8e2c6993294ab3ede6a636a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZZ662409567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8688c57ea9c1f5fe338253aa05e1171b63ef6ec1b5f535fffd3a789f2d761c87. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR59R2374784.