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 0xcc3f4ee92b255ca66d31f47dd32e24190be6538f9d196852a54c4f99cfbf1092. 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/eda94a39-a418-4beb-a766-52ff25b251b8.json and https://artists.proofprofile.net/proofs/artist/eda94a39-a418-4beb-a766-52ff25b251b8.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 0x5ee5fb20c03cc649370d3f2129668c75daf09f9abb6719c1d1ee37e0e8b3857d. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FILVE1100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43af03480adaabce633fd17af149ffc6e0443a5ffe0166a57b7f02053d38fae. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/FILVE1100007.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3102b9075edd3f2c04778b8628b14350a3add662a7589ea309600419b89046d8. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/FILVE1100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda34fcee30e3fae367291e4d82658faad2fae5723611e58eb17ec51e48e1b5da. 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/FILVE1100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a34fbf15d012ed0c61ad5cc9150ae6d52766425809a50fc4184e1dd803434e2. 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/FIMRR1400172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd009a1151510260f1a1aa7bfc5f7bbac7821f0441f67e1f21dd4595c05683fb. 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/FI5CK1503515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4286af93072b5a3d1dbeb921007b14a7ca3be7330ec58c2452026a7899c5e0. 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/FI5CK1503517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a95cda298b6039e0df63c77a06b537eca9e1cdf6f5fd9f1b1f1da6e9e14882. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/FI5CK1503518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9255ca1326dab758fb56268290ca77c43adb314ba8c51dfce8769c04a776e15. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/FIMRR1800109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b219281a9fc2ce4ead7545fe963d17f4cedee1a002b417b94c3cb6d38ef53ef. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/FIOVR2000144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2196c1dbd8cc1d350287ee6f8042c695beead2ec732194806bce755a6dea9811. 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/FIOVR2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33639bcba60321df6effa7119c5e85e3a305f2ac90e7820d71edfc1278ca91d8. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QZFZ62418351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d6426248c1608135b1ef2ef345016584d158148ddc63c443457a503016ee9a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZDA82486197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032eb8f972413eac680b369ac97cceeef51280f116d2cc28b5b175f228b4cc9d. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZHN62455620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf21c44422c8098c0092a3d937699faf21d2da1df5c124737aa7ee28b6424684d. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZK6N2475012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b641f674cb5a47c084ed9adaaf7258f4f3f9b00f5b9c3bc65ec3b3676f5564a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZMEQ2443176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8f09f1f08dcd703254dfaad21b3c79397b9d7e659292f6028801ac2ea710c2. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/QZTAT2489625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e52a0ccb5e75dbe1d9ac99d4250be5b80af8c1154bded336f0c99d3ee4fb8e. 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/QZWFG2434587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e40b1670bd1d51bd49d602b67de785b6d23b6a724bc8dff4387ea2e968c4c45. 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/QZZ7N2408882.