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 0xd44575c1b79f9a07c1bcd6a8086af64db06ad613d34c51034ddb738cd90d7394. 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/e6ac2667-d5d0-4c57-87b0-3f0ea2c804de.json and https://artists.proofprofile.net/proofs/artist/e6ac2667-d5d0-4c57-87b0-3f0ea2c804de.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 0x7aaf7e77d7aff55b141acfc807a6eb000bd21ca77d872566e02109ab2b56ada8. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/TR0430701558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7181c37a0c075f2c520f699305bdd4038161ee5c2b91fa5bdd9ba4ccbd0b9c1. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TR0430701547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aaf7e77d7aff55b141acfc807a6eb000bd21ca77d872566e02109ab2b56ada8. 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/TR0430701558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b420e4a6be11cd1d7352a1cdc8cac67978a63953c03a6f25d8a52ff3d0ea62. 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/TR0430701549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7181c37a0c075f2c520f699305bdd4038161ee5c2b91fa5bdd9ba4ccbd0b9c1. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/TR0430701547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b1ef724ac9b952a0fd078236cf8f2a1e72a92d65d0e581e55307262b9fe352. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TR0430701557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b4ac96b9f78c979675d603f129e350aa91e05edf34ac37b4212e63972dd58b9. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/TR0430701552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3807b44a9396bdaa9bccd001a5a621092407814dcfd5cd3c50114fd7190d05. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/TR0431002023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x436c7353589483513ebe053e9513f067fc7b98ce91e9662381a738f4aa03c222. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TR0361300088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a42c420f6a6aadcdd197aa4b48b3df49d607b11b3e7832b23ef58345f46c81. 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/TR0372300037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb275ce88d0e9fddd3feef33ccf7025122b290000c195d8f9e9aaef1f6df0c20. 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/TR0371800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a60613b599c7d25ed070c3ca479e1a07f500444973823179ba90bb17be3e844. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TRAEJ1600109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80493ca7b54cd1dc0c8a5d01940cb005c3ea9b178fc91dc4ec44d91f2a637ccc. 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/TR0361300091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845da7f02101d09187be9289f4bd2e14b1ad3670cf59590bf8207d0c9e677c9a. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/TR0361900023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264d55dfd13291296d754c221877eaf2c259c37f9e5da2f846a549b12080da50. 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/TR0172400087.