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 0x602b645e9a33a67e83493f09b834dab279de0c07a670eaa2ca3a1170ebaef4e8. 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/bfbceeb5-f9bb-4c51-98cc-37ee69bfa973.json and https://artists.proofprofile.net/proofs/artist/bfbceeb5-f9bb-4c51-98cc-37ee69bfa973.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 0x34794376ff1f6572e35d1695c884f17132154f91146c0b13d197d08eb8db7c80. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZES52171456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06ba7ce3079b2df949b82b13fce6a4301cf92ef7fea67761a3a4a751db2431d. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZES52171457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e876a06d8786440718f9decc09d0c80af697726b11db0814d85a76c4b0b921. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZES52171460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4320b47c78ec1a3d598906045d32e696fe9f1a11e3a3f3926b71dd21c0f8a5. 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/QZES52171466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf76b5738b6968a0798e46aeba9848b0e518431a2074ba4f123fdab86ceca9907. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZES52171467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3f8010f3a76f93f74090a3233b99fad0ab187e11b6b68e83de784a20de9c41. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZPLS2189894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e76aa12b62f842d6961b07258c5bb0419bbe061fc517fe01b342ee5bed295f6. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZPLS2189895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48786a1fbe9197cd8822ad073717d0efe513c0ce9b40f40c1e6faadbfb133372. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZPLS2189896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce3ec187ad330706e85e774e20f06d011260821a75c408b90b20373b4fbc5ba. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZPLS2189897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575726e30cd4a3525e31c1480cc4d5905f7f75dfc6c08616d3c3333092f19cc2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZPLS2189899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2c77804ea84daf7cfcffa313f6ce60c74acf702b455dd6f70049828561656e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZPLS2189900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325a87cd12293daf8085fca5d900e900ab6e01a3cbb6838361e5d261c5071974. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZPLS2189901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8308b31cfec447150f4997a79293a5ffe59a3c4470b2edd3265aca03371b1df. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZPLS2189902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3d330109e79cf1c073ce2b8352c5c4e2dac1620aa17325a20663cb9ef6f7a2. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZHNB2289792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab91f821cd865f35a583e5abb4d179c4794d07798e6417c17b7c9509b88f105. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZK6K2099231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fac45cfe79aee69d16c66d1b6ed393c2a87596316201cd167bf34142a850684. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA42026342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2c2e19c8c19b2845a5c7dcd29a846dfdc414823fbf5b0179bd096db1e16b49. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QM2PV1810505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2c2e19c8c19b2845a5c7dcd29a846dfdc414823fbf5b0179bd096db1e16b49. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM2PV1810505.