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 0x5f694ca707d6774092c06082ac375e035f0147a3fced3906a7df08c7836332f1. 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/da00f8fb-8e16-43c9-8a51-9478b97044d8.json and https://artists.proofprofile.net/proofs/artist/da00f8fb-8e16-43c9-8a51-9478b97044d8.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 0x274c36248ba2324f0960befd0ba63561a53fc1b0f5ec4d4dc781365ff9ea58e1. 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/CAGOO1985401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e3d2ec0ee75b5d963a4024303a48253841f588bfe46468ac39c96498fd3cd3. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/CALVP1940193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fec75f3216975210a4a9d7653565dcd5dc50993147b1444e40cf337adc766a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QM6MZ2220570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20493d4e5fed7c97059d7bc9db9039cabac29e56a55ec08575e9b0af6db6715f. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QM6MZ2220571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae1ba8a4f7ed34fede529aeec0456ab345f647a7c1ae97aea859903a771a6cc. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QM6MZ2220572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da989fa32d3d5b329ca6a029850f229f060cbecf7d2803e7fad78d6aa9c24b7. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QM6MZ2220573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf501489342ed3ad4e6c487ddde235e3448b0aeefa47c0cb0724b3735ce64885a. 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/QM6MZ2220574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e526e717839fb19926db829850fcb97c871ac870b17c52d8b21a35dc601d1a8. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QM6MZ2220575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a374d91ec51a5f43dde904fa343d141865b68e8550cf5bd1bb42690d2c07d1. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QM6MZ2220576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9793e9c8e5373c34dacb419d7cad1a53c87d5e3197d4080b473a3272b98dc5. 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/QMDA72285518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef1910bccf4ac873bea0f99c41f9ff0d495de23fb506c2b705e8ed1a02a6a4b. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZTBF2321429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c22e1550d1187e43da984964eb1900655714c79eab63105ed6306346d4d81c2. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZDA62461401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffaf76aad6fcdb129e6829879f805ec4b6ec5f6ac30961a0324f401f0cdcc8f8. 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/FR2X42568180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffaf76aad6fcdb129e6829879f805ec4b6ec5f6ac30961a0324f401f0cdcc8f8. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/FR2X42568180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb978ef6c60bd8928f0a8ab1809b441800845af6c5660d23e8dddade58161342d. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/FR2X42594729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e9f32f165cfb76f114e286d58e2fbe7ebcbed73fd63a3d52dd688bc4a45ffa. 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/FR2X42594730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c22e1550d1187e43da984964eb1900655714c79eab63105ed6306346d4d81c2. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZDA62461401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0827177aacf922acd284f55f8f91e0c0d36afb237e641b8bb51bd16831401233. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/FR2X42594731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c202550ac8c92069ff7f6afc4c7db1fb3346cdec3992734fba4653015842a8. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/FR2X42594733.