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 0xf1cbd7cf4151c4320f809cd92378f14e22168b0ac6d6586696f950dc1016d021. Chain 2 (Bitcoin): anchored in block 953618 (2026-06-14T09:16:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d85dc2b-5dfd-4bb0-8878-7ca108aabd4f.json and https://artists.proofprofile.net/proofs/artist/1d85dc2b-5dfd-4bb0-8878-7ca108aabd4f.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 0xf06006dfb2ab2818191bb3435f124fe5862217b5aca6a738f46acffae54ae319. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES71G1501123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc88b337884bac8f7e62ea8f70f317959f4f2544b86c5bce8d36757116a21ae. 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/ES71G1501124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a15e13364f7c6e4d314e43d3cac31b17619d430f6c29c4c41158b63769ae73. 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/ES71G1501125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb878ce31a820ce8b00e5ede3a7c17bdb8db581cdea1a4fd6bc070263074588b8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES71G1501126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91eba9371ead3a32255ead23bd958703f0795b8319a69b49f2d3ea430ba338d6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES71G1501127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfc626a3a00ca8be9b81d30254a07600cbf111a22acd9f9cc3d0d26c518147e. 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/ES71G1501128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499a2f976ae2cbfe212b87a8456cfb044dcac55b8080e391a7a647c41e665355. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES71G1501129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b619be2eb88553d88b27d3c32a0e415b58ffcc8e53eb3a9714061faee2949f3. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/ES71G1501130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ff891fcc832eed727ee5eda59ab19f7acdb4eeb21050d3240def06ab5fa3e3. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/ES71G1501131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd2e87457e97ccd29b6e1eba219bf67ae3b7a151c50f5f362337574160a952f. 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/ES71G1501132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80589ec1f1b6d07cf28bc4d8b3536e3d295e56b6d4941440eccc9b8cd3bb6f9e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES71G1501133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6698cebdf76d30f10db1f786451e1cb21bf4ecc8d9067c93a08ee6943feaa91d. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/ES71G1501134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471a197bb9baa6b252849be65eb694c24e58846f25cf28f6aa42d4aede7da2a0. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/ES71G1501135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed526870faf3f1bd50de8ac7153a759a40b771ef7bddc8738b654ed23fd7ed60. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/ES71G1501136.