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 0x9afff567ab46b3645ce06f7f6d70f75bcee9e5641dddf21934f09df21474600b. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f3506413-ffa2-4aeb-8fae-51e64e370227.json and https://artists.proofprofile.net/proofs/artist/f3506413-ffa2-4aeb-8fae-51e64e370227.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 0x81ee73fbfe492eb093f06a89ec354874aef850f6ba6bafd80af6c0e49378a761. 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/JPF662200097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9ff8bc201d6be06f050f8cdca56d5a079efa5491849819946f5f09ae53cb4a. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/JPF661900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3933934655ebcb1098fcc24fb5910382767b4e296b54814f06a652da996ab99. 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/JPF661900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80305a4ff22472340d46c47c1b700545123268508ddda9d544c61c0a6a89987b. 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/JPF661900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e37c70a725c22b984c9b0aa564d25f11feb73517ebdc380cae7f37088c5f19. 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/JPF661900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e4f22e164e6e7888ec23f735fe0a1b11fd3d7148de54e1a3b8a30b9c53c4e8. 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/JPF661900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b3a995d6af4b8d73e2bcf34cca9d8c4cb2649c9d200b9215a46ab77cd73aaa. 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/JPF661900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d34aab7dcdcba7df84f8288e5b911c9b7e82fcc20914f60374a3c539570e76. 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/JPF661900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa309b93a95fc516c4d7b28c3e18d49f5a96a43c56ea28851323fbf3ae50007. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/JPF661900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72448a93b68761f36ee64e75438c9cea64e6b02f5e3f41dd20329675252d1fa. 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/JPF661900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f08bc079b5204d210c1543613b76a2f8595f1489e8f51637089bc054daa1b56. 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/JPF661900013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4aeacb5d29e12534a72385bca1fea1c24ebcf63e9e1fe3ad99d62ab704dac8. 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/JPF661700035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57fd9097794eec14912e66bee8a61d6299aea062c90b5230f90040b97b542fe9. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/JPF661700036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7653c8b8313e1fefb57a50b932e7c072f8d019afacff8b95c67134bc02b09ade. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/JPF662100109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372cdaed5d332b86d6a5c3f17dd5c6ef005eaedd871e59411e1c0411b568a7ab. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/JPF662100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9ff8bc201d6be06f050f8cdca56d5a079efa5491849819946f5f09ae53cb4a. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/JPF661900004.