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 0xbd3c189cef70fa316fecf70f51cfe137759a53ce5af5bac72b7ac262942886a8. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/46a3332e-305f-4257-9d82-5fda2d2c90cf.json and https://artists.proofprofile.net/proofs/artist/46a3332e-305f-4257-9d82-5fda2d2c90cf.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 0xa90c9be492ce90ce9904621b56df29bcbf8f6196a40d6e7cfe96355a2ed3e7a4. 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/QMGR32200227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e992028131820c18c9a503967aeb9465959702aa4d742e5e1373a098929ab90. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QMGR32251030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456f78ebb8603d650a18895da26d6d24fab51e33ac3335bdb42e0b725fe39fdc. 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/QMGR32251054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf055ecf9a9a56f18a061feebe942b08e988279716d5399a2814a8a1ea449551. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/QMGR32200234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574b2ec84df627f37f480850e2616493c2c0701bf44aebe48a9fcecf9d4b7aae. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QMGR32251055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f11041989bc38baed36ae9d6c1af6b3fbaea9f93f27ee8356200e4f8d33ca42. 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/QZQAY2148295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09656228d3ce45e5fa236d1efeee93633441a2e009991bf8e6f14a38be301896. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QMGR32037838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf679c9a8c227eda219ac2d114dfe4b2883abe3c00d0daeaec9bfa7b9428f1ef. 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/QMGR32075209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68efe8ad053a38831ba1708671806f9072262ecb75f0f3db22422a37c27fcb33. 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/QZQAY2169179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0e93d81737fdb6701725ebee7711b90c5fe936fca56752a3e387d6c4f7a984. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QMGR32005515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80c14a905180c7104f7ad0b557987df4562982f0757772c1ebe7d1f68f502dab. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZWDD2303974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25e7ec0405d37a931061891420c996b6168f383a0ed5df2fd732e4664e07f07. 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/QZ5FN2443121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae9c3a6682d1f06a06cfe752f43fa2a838d0fd13d5ec388ee2e41134aadc311. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:15:06Z), 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/GBRKQ2490219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf6e63a37b6987ef176dea5bf47aaef7d6a5b79ee16c088971895ba16372d23. 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/USCGH2164785.