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 0x0498ff4a2d2d09243945df8218c2c5f8bdf5a1f574963a092464dadd129da5e2. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a00cc8f7-cd4b-4565-a8ee-bc4a2ba4c84f.json and https://artists.proofprofile.net/proofs/artist/a00cc8f7-cd4b-4565-a8ee-bc4a2ba4c84f.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 0x60a7046e69d686213c6f648a9548e8c30f6191c4234a5a11c50742a6c8acede2. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZK6L2592630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe591c8e81323dd4dee1ba73c90d9f8f6f995441d499e99d3ba3460a4faf56c86. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZK6J2530702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54b87e3ef3e478d41d56f32dadfe7fba84dc2528d598c71c87f1522d26d6a91. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZK6J2530705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a41e258e55dabe7aa04df5952a7761ef62572ab44911591b1f7015dc1c1aeb8. 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/QZK6J2530707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3db9dea8f5613c52c06ec111af1f1f56b41a07e44195a3e98171754cb50ff1. 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/QZK6J2527495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383a9126af87c146728ffd41f5ad7bdf025f85e749794b9343d0e4d7c79b3a6e. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZK6G2510573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575621a9124f281a770e1890832297620b1080b64d1e1fc6d729039fb27711ef. 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/QZMEQ2587266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c2d4b6b7257ceb54f5b8f9dfaf4edf3c9c8ed734eb3237d9d5f642e2535174. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZK6H2530916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0225d2a5dc7f7ecc117091331401d2859b41524615ce4d6d8887ffca4992cc00. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZTB62523165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e4260ad14a1655d051e6c6bdc2d26e192505b6ae9fd7dd3defe175557e5aa8. 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/QZTAW2509396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa6b2ebd280919b2d21924958fb304ef1b8505043d85327987540f50d1a1d01. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZTB72559869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7255104e16686c66fc4d143374b90d1d939da446362d8dbe1190ed9cbd5eb68. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZTBB2560928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33c6ebe96c8cb78e75b4355695ae3140bab833043b20bffa6f474cf5f357c1b. 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/QZTBB2543702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20bff51681ee4ca94361c00d692c31b2d89b5cd21e8249201993812f038a907. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZWFF2557437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c27df79a6bd7b92cbbb90e3e5b82e8081cc060aafc9c00cdb85bb6fa162a2b. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZWFG2519355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2b3f9b084b4513473c72a4fe79f62d99e70d83c086023b2ca941549cf21a9d. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZWFJ2596922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed4972b43e254a380a501cf5a7ad91bdbee18c1f1cca5d6ea05ebeb322143cc. 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/QZWFM2586208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb239bdd587946aa968316da9807da80b9478a40509a6faf9e90b912eb8852613. 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/QZWFM2594826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9a7cd33f77116f00dd70bb20568bb669f6631374057bf0b8c3e45f4f5d4faf. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZWFN2566391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7aa4809bb5c296cbcab086c9c00d404788b500dee1968fc1cddc424d294b4d8. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZZ762531206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed7fc4310d555f3d737391e72b6e297353ca8ff16c9e22a10f3da41adcf2220. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZZ7N2550189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ffe665bd41a32bc49ab641dafcd32199133724a1900210665f92ee67f71f6a4. 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/QZZ7N2546487.