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 0x69f47268f4e194c3a29aa223b28ff0e0093df19d91a15c43fbcb81e09be1215b. 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/72df29a8-9a11-4c50-8e02-a959d1d80e9c.json and https://artists.proofprofile.net/proofs/artist/72df29a8-9a11-4c50-8e02-a959d1d80e9c.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 0x48b087fedd4eadc6de113a86d747cdfe5c386246cc84fcd3b537d2c0c84b6438. 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/CHE022100046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ec00ec06558878b1ae99b5a9f64d14bdf45a65f49d9ca617e954484c822ebc. 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/CHE022100149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7441eba6d3e813b9281c2dce6ca55604b7728ad69e523bb4249d2e3e51162aec. Chain 2 (Bitcoin): anchored in block 958587 (2026-07-18T17:06:26Z), 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/CHE022100153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53a649fab5470fde297b56eb0924b47ad74702a7da28d57198326a6c6f79b20. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/CHE022100156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ab11935c56c9cc016375413b8845307cc188d2c779b3b9084adbf67a12f8b2. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/CHE022100158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f26cc3c4e65c034bc69f6fa50a5e55407e01f8a4ced2e5430d21b57452d8bd. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/CHE022100160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c14d9877edd172b60e79bdc86071055f8823edd7eb964debb9997dd1811051a. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/CHE022100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7de31f40616dda094356b48b247322518c80bc131ae06fa7f3e0da63537cef. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CHE022100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380e27388981ecca14a40d568c45049028431bded98fc7ff1052effbf3ab0686. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CHE022100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c506c09e154d9aaf6daef378a61665ce6c8c86b38245e00734c29e5c97549b0. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/CHE022100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef6887e4e0389c82b49452570179d45946d9c39ddf76f602c4d9d6ac03a33d7. 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/CHE022100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e6bc5ae6b25ee0003bfaa199fcb9f8714d8694ee9569f1a616a9e3ff96b403. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/CHE022100116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706003e4bcd3ead7d1b7da1a6ec4232955702fa83df2ff92343ca994f2382cb0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CHE022100120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9121d006be3cb5d6854f727c1b15b120dce62574e2dffaee309d85a9939ef474. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/CHE022100083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378fe09a2eba7e7dd13761df01874716d9c2b891f74cad62d04a8a70749f97a0. 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/CHE022100085.