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 0xf9473c67b70adda1a4f1b50ef8304870860cac73800a0fcf580363c98a0ce2c0. Chain 2 (Bitcoin): anchored in block 953670 (2026-06-14T18:07:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/57e9d3c1-b755-43b2-9ccc-5eee091bc908.json and https://artists.proofprofile.net/proofs/artist/57e9d3c1-b755-43b2-9ccc-5eee091bc908.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 0xe06d35c7a68362e485eab608c22d846b13e453c303efbeb77457aa44f531fd73. 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/UKR6V2341256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a01b1e23c72f49d0381123c759452b073f6bd83a2635d936c8e6b6d5f17c8a3. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/UKR6V2341522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ddea324de6e750a8b6d35e8260ee64b3b88d2e7b60a0c636f8bedaaba0537c. 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/UKR6V2343515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fe49f742e2b0520f1dcb6053778aa0a28edd998ecd8003f333a16611a26b6c. 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/UKR6V2440201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9b98e49e6708ab8473c8a6719345d711936eaf61b8ec5786a1a71d73918d9f. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/UKR6V2440014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab7d3bd08045bed46fdb7c4df7a152bc3e8e49bcbdb1d95b0470d26311660ab. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/QZTBE2461274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7464523d36c32350c875aa363ccbfa7d7ba29ff97c13c80d604f396890a38b1. 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/QZWFU2477128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ade86ef8b5e4ff03c3c75bcf703d97b0657f91a54baca6fa63c931e2188cf6f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QT3EY2497801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d170d52d6062b63e2100088a31f3b43b2cc9eb84457f4216b131cb2d5d5bb1. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QT3EY2498523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b50f622f6469c175b3f49e95f60b108bf5e7a572eaef57eb0fd7d6900dbd14. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QT3EY2498529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f070ba08455fbfcdc9d01b981de4c94a67bf3303a6cd7839dd8f8ada0c6816. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT3EY2498531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65dda0ea488245b83c84126257c8508a4fd6469810fd28e8dd4df11cf65ac0c6. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QT3EZ2450654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e91a169425d76b642587574cbc85eb4531358004b66f4645eb21de2695f1c7. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QT3EZ2486861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7e45cf9b1052e256372f4c640819f66d3da9f21a2f83e0352f0dbbd8016476. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QT3EZ2488520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc48f6915b90e07f87e5465689904736912953947b45c83554233beba58671ee. 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/QT3EZ2488569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a74107bdb615a5259e9afa4895d32b4bd26009110031826016d94babd22343. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QT3EZ2488576.