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 0x193676c1c250b122e4811c7a21dda31274ea173aaae11925e64931e6e44319b2. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f319cd2-3118-4c43-93fb-0a3596a9daf7.json and https://artists.proofprofile.net/proofs/artist/4f319cd2-3118-4c43-93fb-0a3596a9daf7.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 0xca2ce18b78baad02d17c7c133eaeec7b56a3cbb40f16cb34140ba53b704955e1. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USCGH2311423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45755eed05b37a5ed53562741ca3c1a022411bd3f685e922d7e823e16778bbaf. 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/USCGH2311424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497576dd031c0dc20e200e1ab01ed621f89fc2e09ee9727656edb74eb7411005. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/USCGH2311425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314a866f020171b26a2e353b27a58da991c25f128e461da379a8718bfa76cd96. 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/USCGH2311426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09cb96b9c8a8eb0a6c7486f5a64188effa1a17b6b3358a518ad858fa644a7c82. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USCGH2311427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333fd6e70126f70a22107901c4798e360a5a8c21f34f5b902e2637ae552ce199. 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/USCGH2311428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d59bb9ea72fed8a961f34908ae097b5cea5a2d4c02c1eef08c5b30dcca9ea6. 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/USCGH2311429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb793cd35df06aa70a9be597dcdd65dd80e2598cd0eaa234b60fdc4ee880bc9bc. 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/USCGH2311430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d62ddfee603af0cf2fb317cb8c80d1c6c10a5b713fb62bc6c2b94dd0acfa5dc. 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/USCGH2311431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854eced79bfd50986ad1423dfe055842ba8da543021afacd10037c6d32e994c9. 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/USCGH2311432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f75544684f4dac02a345d8c2706d6601313c80a82ecaa4cdff8f2bfb33f618. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USCGH2311433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f32ffe331628fac2ca52764b15df71cf1a2e31c0ae466fddf26818d957ef7cd. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/USCGH2311434.
Your Hands Are Cold / Liz on Top Reprise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03683e201caac67f8e1830beab6a88183a4e3a9c2fc80d8c8828ff72cc9ac62. 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/USCGH2311435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac73bfe49cdd1a151fe158fee701bf4921bc3b0175e3bf31b27a34fd7f10e915. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USCGH2311436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee4ed22c7ea064e66145ee4cae2a50418b8b82064c1f8a5ede8e168d4081dbb. 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/USCGH2311437.