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 0x31bf67dd2302308268272ef0b3a5b40019eab60d42d14138e55ca613fa6a038c. 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/5273534b-06f4-4bd4-90ab-61521e67dec2.json and https://artists.proofprofile.net/proofs/artist/5273534b-06f4-4bd4-90ab-61521e67dec2.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 0x7a51c19e847763462a5bd189bde8931d356793357aec6a41a7cf48f5d77620c4. 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/ES6492136501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ebdced394c68fe48d868eee92ac17443659b73ca698965af7f9c72489aab33. 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/ES6492136502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c518f862cd57c244e80fc92b61d241799e2da1ebdbb66767542ac3f4eeb4f5e. 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/ES6492136503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b469d2b2d7539401de6e5239f27c4219f273e627c38cc20007ebe3097e01142. 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/ES6492136504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4aa5785a21a2b6909f1da0371dd2e681ea03eb93a8ed7bbf6c0d503e89b18c. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/ES6492136505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe19fb42b2c0210d1fa196fac8f83e63df39fe287cb49d7f3457c043e5d22e8. 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/ES6492136506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c5dcfb39b375191b7317e2f838526fddf73526e6796e060e65671c055f2f77. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/ES6492136508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf041084a3a7625ca124349ebdaab100ee8578b64193c8a88c770024a72a33bcb. 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/ES6492136512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210b25eb507c98ea28b563b7e8b63720535bf84d75605bcd89594364b89acc4a. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/ES6492541003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00adb9d5e07d502e5382cc423e1ea4998f44f4a9122500b1548b3d34bf90a357. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/ES6492541009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef649e5ee491320f87e107cef2dfd94c971105443ace462129f852ab7bc4c03. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/ES6492541005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d1b385f7a913ab179e3441e210062866e4e451bd9857116b2a5f2f2097328d. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/ES6492541006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a863a6442054c6756080ead343956b299fd38b719d30e2de955bd19198bfdf4. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/ES6492541007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd97e60b534d46e755a0df54a7cd80bfceb787aea80d7ea63787f58817bd56a. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/ES6492541008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00adb9d5e07d502e5382cc423e1ea4998f44f4a9122500b1548b3d34bf90a357. 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/ES6492541009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4587e90fc5287724b3e4b7af8f8767bfbd7f1e49a75413d6212ab776587350fc. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/ES6492541010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aab45bf1ac4f5f7cfad85448f9a2cc9c616c79397684bff36ddf07dfba51bf6. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ES6492541011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbc184c04b662ada8ff132b56a4ddb41b198e9b640c93b2078958c561a3a71c. 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/ES6492541012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9992414f5ab76c25686e5a0a9712ad3e5a1d33ef339d66063efbd7c59dec73f. 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/ES6492541013.