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 0x3d99ae5e74c026c9034f9fdc0efd8562157705eda4ffea58b190851f079493c8. 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/f8e47571-9b21-4087-9022-d5371f0f3f40.json and https://artists.proofprofile.net/proofs/artist/f8e47571-9b21-4087-9022-d5371f0f3f40.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x6bdbebd436b00e1c0c640ca38fd354208091e4cd757d9c68c1a0c981fab284db. 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/QZPLR2417684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a3b26ccaf63a74ebb2928f57776060853cf53f9949133c0b1f58a925074a66. 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/QZPLR2417688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7eb581b80cb009dc96d471317cc916d63b28291134d36e5eafae1b6ef31aed7. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZTAX2466595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e80c11794b55c6ee7f4e795a818fb154656b07644d90ca4084f88ede7dd350. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZWFK2472868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed7bdc97c36f3b3584e9f325f47c51f87e0c3bffc18b1235ee9ef8d58509ae9. 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/QZWFQ2424062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9823a8081af4c87eb92741a0b62e1a506d63108c4239ea414a09727862f99113. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QT3F32476956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd571a9548a60ce3adea11031a362f3dbd54149049cddc8f2f2632c350258d064. 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/QZFYY2594833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x315ef572911c0a55f337ccfae4ee6cf52da7c7404f04a7c96a6f1d77f4dd253a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZDA62520866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782dbd653e8cfa7ad2209ccab5e06084d12a38e81a363bdd318f5fe7eef983ed. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZHN62533192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf40f22543449f0b301c9be152d3e963ebbbeb8aa40b08039acd6340e9f685323. 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/QZHN62533193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02480e37b9ae346289f12f7d0fe6a0adb3094cb18be7d9dcead3a7cff57e85e3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZHN62533194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7c3cf2953ecd615d665facab97a20bc58f9bd4876763361e2eb36cf2ec50e3. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZHN62533195.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7eea2b97017459ff477a75ec9e04f9918ff76c1e849ffd757814ef0f78f5a9. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZK6J2549601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6442f8ef2108152b13d72569dd1727872536dd1a92ae407e74b44087a3a5d6d. 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/QZNWS2592774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59dfaeef0a606d2bff3d34f5ebbb7b032f2b6e73ba1e480070456ab526162e5b. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZZ7W2593335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x153ca49a34d27af0ac446172a7b72d6033634f0bc9a1989b410ab5d4f8001ee4. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QT3F52562302.