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 0xd99ce686a6cb2abedf05d91fac998e35d541e6540265e2ea6378d68279d62d7e. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7add59e-5ebf-408d-90ce-6e8a8552a009.json and https://artists.proofprofile.net/proofs/artist/c7add59e-5ebf-408d-90ce-6e8a8552a009.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 0xeffb4ebc59e6013637cc16426ba457323541e2d63bcf946b6bf6128b9a7dc83d. 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/DEE791502020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b6eac6ea3ec77456af97fbdc459d4c67d0dee5c28156ba400b812f1e4f42b9. 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/DEE791502040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4196a1fa597c0c18caa079c6f99d3b83af1c5f37b777ebd3c578726079028775. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEE791502050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94907d986d06cf908e075a014f92191b09f36b3d83764a49c207c0d6f7e4a8b. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEE791502070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88166af7d0d6fcad3a5aa403276f90a504fd945426f5fcb681ef41230021db9. 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/DEE791502090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd939a9ef13cec7324550b25f4469f9bf4ad8b9c5056cbac9cc9df95901345ca0. 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/DEE791502100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28f4d68232f27a454c83904bbdd5c1858d224aebf95d8f6d58b4bf9f624628a. 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/DEE791502120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2540b7635848988d9cf4d653b1f1733e6b00c4bc9f040f782e37cc4ad53639c1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEE791504210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af913411c64c04c39783e4b6f32a0196e095aa5e7ecdb644f87296d7407374c. 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/DEE791711410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743d3e1f93d468c8b88edc3511381b80a4cb4ceab22ae0c3799246f4b6c6a586. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/DEE791711420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d946a83af1f37225e569a83127b04abd3ee3f336def99688ff75ee89d3a373d. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DEE791711440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b429f954ca56bc27df6f0bc7f517d253ce415f74ded06bc835be33da8d490ac. 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/DEE791711450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d28ce6bf860c8d4f32c2d93149e6773b86416d01d81d348acf917f8ecc4d3f4. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/DEE791711460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4a78c8e5356953accc79304b102ed78fa8d5efe59cda7b965cb88f59a77e75. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DEE791711470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97afd5497a50277c82b10117a44cf95c6641fcbcd3c7f720ded146e687bde44. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEE791711480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9ab873ebf7eee46d67dff9f692258db08db139f64f29bcfdf0d9cd2cc9dd16. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEE791711500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4156d51041160936d24b68a87f1c8332305fe3a70db06c02e9e9597e1a4be6d1. 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/DEE791701200.