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 0x6dbe135a72f5157ed52475c8c7940f8ec680444af7e378354ac750b0a255bb5a. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/403acf92-75b6-41b1-b7d6-c6054af96958.json and https://artists.proofprofile.net/proofs/artist/403acf92-75b6-41b1-b7d6-c6054af96958.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 0x57abddfd28638c441e4b818e74bf10a73c15ac25a06531520a708c8fd29fb1b9. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLS202400274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc6ebc2c4f2d6ba75f5bf1317331da298879a94a5cf9ff27f26f61a7dd92db1. 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/NLS202400276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6454babd9e83aa231f62e8bf30447075321cdb6cbf737c3bd194230ad56dbe55. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLS202400235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb388fd3a0e72eb680d4dfdae5bb6709a0da40627fbfde4f2c792167594de8bfe. 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/NLS202400196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134c6548d59f28cf783a9c3d5ed564d5f7bc07b39f530498514cdd3d098da45d. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZMHL2266653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3bff449b08df21f724d9ba30f0903be30db08c04b7d18b1afa2b6b9d2c1ffb0. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/SE66N2359258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e31a756fed427c866c19befcc74b0bcd1a977fbf5db0fe8891f4718b7c3c31. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/SE6SA2342581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b51288b4e2f60c0e63b9e27bd0f56c511dbb56e4143e6cb87aee69d86d187b. 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/SE6I32354513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6bf8ab7dc40fb2b9fcfddbce893729a222df551bba4b089c58382531acadad. 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/GBLV62313925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03939fc7e17cd8d6f6e36d2c3793eee023f5e5cfa184a7ed63c28b89a34fdc27. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/GBLV62313926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67aa971785042de4f89e70d3d965a60b156555cb3be305be9f43405a5578b164. 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/GBLV62313927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a3824e0013975f6239781600ceb40654862d535224b1c98ecda08c4093c7fd. 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/GBLV62313928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee254dbb4b520a663ccdccad0d500f64218cd0c75e20a70b9547e46994781fe0. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBLV62313929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aed95a40bb9da5b69e1516e3bb51a5153432e42f5deaeff41abc39c7d013801. 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/GBLV62313930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b8c09968050d47aebbc7b4cde94686d1783539dd52e34138b930d5045c1547. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBLV62313931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a66b25292c1aae006c0416fcc2d774f95a8fff05d0aaa57b2c8ba8a79c2d19. 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/GBLV62313932.