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 0xd5733bcb9887056754d818c2c369c19bdc163b90c1d95f1e5a7b3d9d5e4dae53. 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/669e4f77-8228-41cc-9eeb-5344746d94a4.json and https://artists.proofprofile.net/proofs/artist/669e4f77-8228-41cc-9eeb-5344746d94a4.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 0x903c69e2e2b30b08fe1d1f392090b6fefd3c772d1e1ddb93268833b74a0e5445. 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/DEA372010513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1578739044a1a035fa12a3ad0d0163ed119580997f4847c88a3aaa57d5e95e. Chain 2 (Bitcoin): anchored in block 957599 (2026-07-11T19:42:17Z), 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/DEA372010517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278c46c30dc89bf8f85836fbd8898596350315e5726dc851e42ed680a8d6fa80. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/DEA372010523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa534bf2ffbc52e16fbc8528bfd328fe9e71dba2c3cc0e0e6219f0422518314. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/DEA372010520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe05614e46bf1dd01f632e6b0ea863541fbf06240ac92889c692f57b787d8f0c. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/DEA372010605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e38cadc0deb37ad8fc7e723cf9967306a7520f43247dca8f2281a6a62646f7. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/EEUL32205707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71baa337fbcb2171d3e366880ea4e53d32034bd1d4dfbaefe5348029cea8a956. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/NLRD52046226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8506c119c7bb61ea9b2479d21b25d42e3f67335af98c889b1f9ea57c7e9eeb. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/EEUL32209025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd843b9f6f67c79828e8feb16983ffff2948a49cf46b6e1da6f1ba39290adb7a3. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/EEUL32208851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de6a845252a20dc73d003b5fc7483bd7b2f58e54a2c6641ff27d2ec560a3e6d. 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/EEUL32207951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d2de10c129f4da6b057573a255719badd0af4a2770644521f98f74dc97e3cfe. 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/EEUL32209270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3fb8366823d087b86deca86d41e9c6ec6fa082a9a223309638334ca42311a3b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/EEUL32401121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb329c6c69fce27705e8c381879fcfe18668e17d91e3e26dfe4c6a4331a2030f0. 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/EEUL32401200.