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 0x55207643ac2bf6a99e8fa3e630f92eb3cca7f0a91d53e6b7d72c47a8a17e02e1. 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/e783149a-06ce-4bc9-8a7f-4cb867263de5.json and https://artists.proofprofile.net/proofs/artist/e783149a-06ce-4bc9-8a7f-4cb867263de5.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 0xf5ae7e58daf4de7243a1b9ead4cd50c5735f014851704a17760d057577f1e129. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZES81959568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4edfb822343c4bbb15135f2ed6a567dd8c9631c4805b3d3fb7536c198e170310. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZDA81928868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c99f4dbbe41d368e2826f750375359b4d0c9b8bf2dbae46bdff26070dc32e9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZDA81900183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb8b9203beeb5a046c925723bd74239eb506087e16c2d0c2fd08fc0760888ea. 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/QZDA81900192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3b3c67b1262b199a9ae06e5fcde299fc7ee821da193a9a9f5539f5406ff493. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZDA81900185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa518c4487cf9592b35dcfb231820e70f097774b8e3cb93290311f1b01140274b. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZDA81900188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f1109117b1aa62eb97108a50b0c4031684b750b2cd360193f7aba207520aa2. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZDA81918723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f4b72c02c675076a55cd541708f45da3f1d875d57209c4b6c6403710cdb7c5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZDA81918730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafc4adb3aaa5b718654827187248f16f375ee90b957cf68611b27449e6a2fc7. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZDA81916405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb4a551fd33fcf6aa5f993dedca8dfa74f8aafd3701ef0f88ead6ae8c7ccc0df. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZDA81916410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae67a5bf32e4d7f848c26bf3cfdcc5cb2b476d9f3bfcb207315d8442a44841dd. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZDA61977090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05906b17f72da22e128c70f239dde53644062dc64209f2eafe13a1b5813d3f4. 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/QZDA81945490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb12606ea7beef6ca0302e9ea36d5a1a9611aa4693ddcd1b29359ef81ed73d5. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZDA81945492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea405b0d78c1992ed9eef10216ac89055411db199e5c0bbd42b48bb95d6aaf20. 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/QZDA81945493.