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 0x05a22bdce4628baffbe3864f57bbadf96a36eefa2f293b4f8eda255d7cb8bf04. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eebd6351-9f65-47d6-a094-6831d53dc5d0.json and https://artists.proofprofile.net/proofs/artist/eebd6351-9f65-47d6-a094-6831d53dc5d0.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 0x0af756485c00c12f4acc5bf45e2e0679b8db92a21e5dc53aff88609a45667206. 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/QZNWV2039610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687d3e267768231d6f8d466d30c65d3f623edf37e3b021004eaf1108f1ae2c96. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZK6K2291789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78492ec56df3c8a50137b442775375c58301b859eb53bb2b0b933eecc732d7de. 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/QZMEQ2264158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0982e516bc70a8efd2feeba42d6121f2438cfef4d363efed817be8d19c1ae018. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZMER2210324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f92a5c21a8f24818e6d37a5ad0e3bc62bfba98b7684f2f8730425e4c9c3d7e6. 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/QZMER2213063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a05d4613d40d57583fc3acb200e764e19e5292b5671d3734d8231ce87e2977. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZMEQ2270708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16bf19a7f6827ebc8fc0b0f25ecd0f7fadef6531b229438ec72c0941e3e520a4. 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/QZMER2253312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc04fdb09813f76f4c76468c09be88d7c9d053a1cc61bd962bacc6d956d52340. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZMER2217455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc285d19dac8bf9251858524c428ab3d609de926c1ee7a9c2cac3f1aed5cdea8. 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/QZMER2208375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24283a40c30b7a35c8ed841c680e06574e3e7dcec2aa28e2c482e49e6a097996. 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/QZNWU2239419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc41390da73fc4c930f54390ab78da72c9b9cf70753b4916021f521633c421e. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZK6Q2366575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1597cade8d5374bdc5d6e03838ab13a70a3f653cb617b6d3d3651d3a19a9af9. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZK6N2415181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671ab4cfdc076751da9ef443b88f2c2a0c1a09ed14ee1235c9d54c628582406a. 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/QZK6M2411954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d9415a14017ac7f70a2a22d619258a101fa62c271996d3daa38aefd4918e6d. 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/QZK6H2404902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f90c1db365ae2c76f30cd54527b9b2cc23b855e825501e28ab980b0e18c712. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFZ72560367.