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 0x2729fe3dde13c826ee477e52a14296c829ab8e271a081d247d5ccb63e54bec1d. 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/2b687c59-a385-4047-8c44-5c06ad6293c0.json and https://artists.proofprofile.net/proofs/artist/2b687c59-a385-4047-8c44-5c06ad6293c0.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 0xcc7b13c2f76f685f3866c2abbd5bc74f2e50bc80d542948842097ab8add0c113. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QMBZ92280631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf2f29b41129aab75c489f96435ea137c1de552927ffee650dd7eae2fc212ed. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMBZ92280647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4587c566949320ea12edc068f786e32580690d9cb03c42ae2f8503daed336ee6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM6N22302493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b6435a78c2c83b42f3a27918f2af21199ef1bb0d2eef308d266a10f483e442. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QMFME2368089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1be252755b1717ed13fea8f09f9ac6fb2dc8588890b6ac389dd245bb5f52ec0. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QMFMF2322336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e560d2ab37b744a68ef553e2f01ed643d8733700d6c6aec32414c64c1c65f8. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZHNA2217102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e4c12398669c594ee33239106dee9088f7ce8620bc0739d1358095cf8ca1ef. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/QMFMF2322364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf0f492c46bfbc62be8be29b0c42836a90118421ae5079b6096951a982f6421. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/QMFMF2322380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f375ad25b6fa5a0ecf593c5960e74b5f6793c0509399c1d9eacf189091e977. 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/QM7282463567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b00505a8918f945a1142cb4604e35954b92af250c30d6eca2863e1ad40d723d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM6MZ2454053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139eb2a95d4b7fbe29c3303e1d4929a817a157eef105082a9f52d953a650a9a0. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QMDA62335765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c12b3caf43e29c8d03ba4817ff3eedceba3ff10341bf5f38c014cd9a0c42de9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QMBZ92257350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3b56f526f144319f5238948ab5b28f396912bccbbffb4e30f87bb996c9f417. 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/QM6P42486395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582509871969cc12818c6105d31fec70825778b4f4b32b839eca1ea558d2ebcb. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QMDA62200992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b7f6c8fdc53fc2887c310d61e280c3dfe72a00986a29f32880ab17662319f2. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZDA52230290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c12b3caf43e29c8d03ba4817ff3eedceba3ff10341bf5f38c014cd9a0c42de9. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QMBZ92257350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57bc12f525de16d925208461c32a85c30b43f244f3000189940a7ef5d63403d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMDA62201033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1543f2403eebb9eb9129697224a705b0d4a72d827ce21c786a07ffa34fd435e7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMDA62201052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db005f5a07e73694e745a84c264fe23f8de0443b7a9eff7495922a51671dcd0. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QMDA62201051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e702599645b911f37c7b3157c723dabf8fda2e6ae0ac89a40217cf258d0888. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QM6P42216138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8f5328fee3966523d171743c7daab557222dc4c63c92a9e065421736075350. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QMDA62201056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0595ef142788d71e1a292eb5218ea1210fed728d11f6c7c3debb0048829946f2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMDA62201063.