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 0x11f4419633dcb34353130b9387e1c39b86e52ea0f936612433f61e0b40d87d36. 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/df0b2800-9eea-4483-bfb1-0988c92cae9b.json and https://artists.proofprofile.net/proofs/artist/df0b2800-9eea-4483-bfb1-0988c92cae9b.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 0x03a6592fe46934895186741c7d1a97aa320c6ee8e8ea89ec11e65583e539c545. 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/QZFZ42094259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652e996afa8d3fb5b7268ac7bd7af80a7a708e15b4a3ad6aa829e76ca5931c89. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZHN92186817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a6592fe46934895186741c7d1a97aa320c6ee8e8ea89ec11e65583e539c545. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZFZ42094259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cad98a5f90698d228dbdb2ff0340b5e1d9df3ac6152c0214098950ebc014db1. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/SE6TI2124410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b69923780303c4fe875398769dd9aeaba2d022fb1638870cd249f05b4ee9be4. 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/QZES62113309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee9f1b18a85598f7d6024d65e73d761402e2bac256f77959d8108e6f61ed81ea. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZ93L2104420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652e996afa8d3fb5b7268ac7bd7af80a7a708e15b4a3ad6aa829e76ca5931c89. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZHN92186817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2851f9c2514a85b22e301280194682637fdd8f206650c9aaae77e5131ea6647a. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZAKB2168441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54a471fbe7a1f71fa7971820ebad1de70d7b680261596eaad9c9b2d42b9d9a8. 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/NLRD52223452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752c266e48d9f057dd0ea15e3ebd2743d74173eab29a095e0b7ae7e3ae0c578d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLRD52223514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcacdf022492e14dcd75da53cc47feb2b7d5fa46ab65588e3eb71baa9a64ee8c9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QMDPP2402118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b467d52b8b69c4436849e1f8608b4498e3852aaeebdde550fe1c31b16f2f61. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SE6XY2544542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6216290eff8020a500f39af9369c52d711c2afe55744b132113bb9602644dcb. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/SE6I32524101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3af2d057440b1257bc437bf713fe77bac634649b118dab7a1c41ddd4b48cebf. 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/SE6I32591886.