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 0xfdea98c2ff6413f1716f89b27572f65d51027fee75700be5675b891e5c60f2b7. 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/87ce9864-63d5-4345-ba33-aa4a51f82cb9.json and https://artists.proofprofile.net/proofs/artist/87ce9864-63d5-4345-ba33-aa4a51f82cb9.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 0x47aefbc6ddb1312506f40be8316ce8355b486d10c5b42027ede9e6613c2d6dcc. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/HUB281203789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ce4af859cf7ae642acc32bab8bc6a36b860c86a8791880fd3bacbf1467df55. 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/HUB281203790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c437d8b7c3a307de0d7eec3b1d662862829e22b9b83b37789ec69185a8e41cf. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/HUB281204988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cead5b200eb8ef565759b8b176bb263220711892347606f67f0f0f7d4c98096. Chain 2 (Bitcoin): anchored in block 957569 (2026-07-11T12:44:25Z), 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/HUB281204998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ee9e12f2d5b95d050350377dc767acb64f82f42efb2a63360c8e6170fb7dd7. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/HUA611604096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae3255260ca2104794914b0eca2309c721b3f5e423611a4bd453c00cc4cfe22. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/HUA611604097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdb26c0d00fb56647b9cbbd503b0a22c38bfaa99402e09a6621943ad9c816640. 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/HUB282101248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd701081935ff725bdfeb23ef07f9d9e7e407dca874b17a659347d447836dea7. 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/HUB282101242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2319604968acc0c9fdd0e7b89c02dcd817e86cea2552ac358598e13a5f0489bc. 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/HUB282101244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3afe8ad960439dd036a00ef3c1bca9063110599c5de576588816aaafe9ba2c4. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/HUB282101247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c8033db4c6b28b3d3894a1b26891616ef67673564958a80b9ea0d53c918f29. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/HUB282101253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68271e2ae3371af9ea54a2f379831525719cd0d1b666a484794cd47f28a6e373. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/HUB282500239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c4e42251970baba03298f7c841cfb414d047fad42ae304fb45111fd19b5378. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/HUB282400729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fbfd14cb9963ef1725cb5549ca1d4dbe5ff3ee33dfcfb54cd5c9ed3d6ddf72f. 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/HUB282500055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b820bd4babe10b658a78bac53adb425998363ef58f297128456735212b9d933. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/HUB282500325.