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 0x9f8764beec8f5ade1dd2d43fcd613fb41e3a54705ce475d205a47b7f3183eff8. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8b025292-4bfb-4e84-8bde-d186843f19b4.json and https://artists.proofprofile.net/proofs/artist/8b025292-4bfb-4e84-8bde-d186843f19b4.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 0xb94a9a3ff0881d17525ec2ea188cb48714c1dfdb10f3e6512b9300c906927258. 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/QZDA82554575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dccd7112c9ccd3cc7da2950857453f4559e7f72ca61c72f72a8e55513b533db. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZK6P2570476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94a9a3ff0881d17525ec2ea188cb48714c1dfdb10f3e6512b9300c906927258. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/QZDA82554575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfec0025e1ae1095882e9015b58f45adf292cda70ba974b9ce545c19fef6de34. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZK6P2573592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b326eb099b8c41d0edad033abcdb7b240210d2c0e7a3e876a72687a453a057. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZK6P2573593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f4043dea8a8c0e08d0b1d8c12cb8302332684c433e8455d61fb4074c13bd5d. 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/QZK6P2573594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66cb1b5136592774b9cff8e2dc0f41b80810fd8eac3925127385d2347778520d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZK6P2573595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3785da2310be07aa2c00345638af1bfc5a5b8ccba0294b65da92d5d56d16e0d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZK6P2573596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33be81ef1a84dbcc97ce8a1eb7e2d095c8e68d471b95f1e3dff86cb02063c92. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZK6P2573597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf1d40a8976269e24208fadab99f3c41ff7e58e9caff3a81dbe8a433f8d963b. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZK6P2573598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dccd7112c9ccd3cc7da2950857453f4559e7f72ca61c72f72a8e55513b533db. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZK6P2570476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ae294a54f26d601209978d6ebeb14dc66613106fbaf29f676b5fa62b82b6d0. 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/QZK6P2573599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d7c01c2f296f271cef063ae2a15c50aad6736fa358435d357af424dfe617e9. 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/QZK6P2573600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74aabae1aa01e93ea4d715e71a96e6928a547d1e949cf65cd5a6e70be2da633. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZHN72559785.