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 0xf1538417d602103f6a035438c6a6b8249d83446e9943e5cd3341571c2282c881. 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/3fa9b6a3-7d19-4a3e-bb5e-8a5d0aaa6a6f.json and https://artists.proofprofile.net/proofs/artist/3fa9b6a3-7d19-4a3e-bb5e-8a5d0aaa6a6f.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 0x72fd9359755549d9d9edf6293d6e5bc59555818ed0fc502f98da2abe4974deea. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZNJV2455226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995edb39501381eece6ec1cf6f5c7b776ce82f699f3a61458f2a297e8b23a93e. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZTAZ2438370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333b824b7fba0fe8fd56082d47d726b0a69708026830b26972907c40bae4d098. 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/QZWFT2465059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b606c029c92a45dfff309462f644f3548bb0b3b62e2affff4c2b9d4d8a8aac7. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/QZWFT2465060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9859a37a88a247e1cc84d4a1ab300829a0c484ca2ca548c433c137fdb74981b. 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/QZWFT2465061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a66447991aac0d075fade3a86e27c1cb76da1b814cd9ddd6657f5e702470c0. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZWFT2465063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424b09a3acd755a31d21d2e6790c3ff5dd77c2d78d9c2570d46b03e386b5440f. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZWFT2465065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80dc77dabb28f3b7e2d0d54c0192ae1418bb63c6dc4300504c250b2d9370eebe. 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/QZZ7X2482364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf227a3edb8eb7216b57486663e2767914816174763a15a9caeb60b562e3c395d. 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/QZHN72533881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849b2c8b151dea966733263be4b1348ff9afbe0ebc9f1be851a6cce2f5e11097. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZZ7M2470293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7711fb47358945546b21a344bae7a705fab5a45035d15e7a09bc7bd5ab0d7557. 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/QZHN72533883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfbe3e4768e34d7789542b8f85dac03b316c6e33bca59000f9777dbca9403dc2. 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/QZHN72533885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214329b454de7ba02815d8da3dd6a0541419ad94cd99638b68c2dad2f0835c51. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN72533887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1ee0e8023b2f57a4bea506ba2aa427394ba95ce22df1d0b79b6334db89f8ff. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/QZHN72533888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599ccb7d52b5488ae3ec9ce838345b91f9f8d392dd78345fd8483cfa1e308a9b. 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/QZHN72533889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b14bf4e957f5117b29fbbff177bcdbba14b1b62e375527770a280e18a393d11. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/QZHN72533890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7ab79d8f1c26700b7d7b1a4201dd20c18b0fc5c45239cc7e91160bd3e403ec. 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/QZHN72533891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c5b46b705c59722d3d7e7b4cd19683d3daeb75d87e5ed9f3125466701bcc8e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZWFG2426777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86546ba500bc5ceee5857914fa83cc39578fcf919f8c32215cec0193f889059. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES75E2503986.