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 0x800679a6f92fd7d7fd9dfae3cbe1e641099f5caf0a49c9ba2e558250f5abce95. 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/dd1cacc4-e71c-4974-87ca-2215bc3fd4cf.json and https://artists.proofprofile.net/proofs/artist/dd1cacc4-e71c-4974-87ca-2215bc3fd4cf.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 0x5800071bf5b74a1b1e58ed6d7a429f500628355b1959c6b2c9be2307790f99ff. 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/FIYM21700084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc260cab8daabd56517c7d59f6239b4337027daee15352d9a6cd70a93f4393b76. 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/FIYM21700087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b2d08b2da1ce7ad58e24ec35b82341b6350e14b4f22c4bcb2637597d48ba3a. 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/FIYM21700088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe803c4098536a0de6567f696d8a5b043b81d7d2ae87bfb708eab0a3ba2af83ee. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/FIYM22100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae7f198c661d7f7566a0c2c493e142d21147bb8ee5c9835c86fb7d1edb42678. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZHNA2161115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b22067f7bbdbcbbcdf9d9ff44ac9f3dcd93cdb2f1d3cfaf0f2be8f4d6bb838. 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/QZNWW2136879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0857bdf7be7264a9ddaa152dc2ed0a820f1b240ee0a5ae3359b545d7b6c06a. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZPLR2154642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36bed00bc5ec79248fe90ac47a41d7e8942adee935a72b29dcb8d3b65e3d8c69. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZPLR2177657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0fa7f4bad41aa859a660c6e0a8913d5da5e4bb6713dd3804aeb865395ef165. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZMEQ2250760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e22159484ba734f4930b25948674de1e72974b929a21eec617c043fe0edb9b0. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZTB52250606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5751b22e293ae9a8c83cab3f8b731718ede097f0de26af921fc7131cc204081c. 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/FIYM22300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf2f0519a5a9ddcbf3d0feab1e6f9d021c52c601cb3142dce47f0b589c60160. 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/QZTBA2394205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473519a43dd89d3d4c96cdb03b4b54e51a0311ae3d1e04de280b855f7de93937. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZWFJ2394019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650b810c581a3e7945eca551860bcfcd8979a92fb60a75d79e5ca31de844dd94. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZHN72452271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d6d528668681bcbb962e3e71e762ad6662f084867f1f673f728383a2ff0430. 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/QZWFU2474158.