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 0x9ebbe98f5e4fa0fb34d570a37b95470bb0f8735e782aab0391c4c6219347bebc. 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/0b167c74-8825-4c87-a247-f5a188ce807e.json and https://artists.proofprofile.net/proofs/artist/0b167c74-8825-4c87-a247-f5a188ce807e.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 0x26a650bb78670edcff09f32dcfd38f00367b56bdf7e1ce6da0ba78393b4e1ba4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTAW2284888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2fee43dea81af277b0657036886c2d6b6d5c13c970043965e29e3ae0555235. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZTAZ2275187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eec30df50d9e8ae0be6b36ce24b6f8b492b98318943353ffbda6baf21ff5574. 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/QZTB82294150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe99dcc4b9eab6523c38f88507c522bdbe465f59c23252e92484d8e8acc805b5. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZFZ32319632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249af6d509345f454215f85a44b145a8314a7107c9a1c75885c25adb36be5f81. 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/QZDA62370942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6835eb962dafdb4bfb2cc22296c784670bf6412b9935c59e1a9f3043da3dd6. 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/QZHN52389745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd5193ebb1a75053ec545c24b3eb9ca6df3dfabd23fc14a8c140f9e1d7df0f5. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZMEM2396668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c1c29185f83fe5a5e64041289317f77a9c6910c558f1b443ae85cc313f840b. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNWZ2394223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90b1d6e40867f32049eea2d2d6e21c71348d9e608d9141efeac7b3915750e33. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWZ2394224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x767d1fc3686be8d94c794f0f2f48a69cd9093197c161d59872420f089a24e42c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZTAU2364679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a87751e2d3efd61136882f161c55122ad243ba3b0c8485fdcb77483afa1f185. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZTB72390806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601d51d6e9a77ba92be79d536127e01d70dc21c1ca08f8e76d171fb20c81b757. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZFZ72482110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86cd49410c0c432729f44d89cee19da42358fef4ac951f9822674e673e51d8ad. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZNWZ2467091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc0913a3f6acfc7d37e3af29709ebb5c6cc435cd93005ae0381530234f9806e8. 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/QZTBF2486692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46d1c47980cf6ec4c372aeedd6d42090c0d3673fee1de743a325c48b4676658. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZWFQ2418564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd74e5fea97f594a834110de92e31714090145fec3f8dd23a4ebda17f834ee05. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZK6K2553461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a5aa8b602c9c90cec189cc6f0278651cf219b9e0b652f761d9cd3538293fe1. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTAU2594904.