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 0x26877d97c44cb66960a77c96972a761fdf2e4cbffc6b2139106ab4eb01debca6. 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/35fdeb3d-2f42-4f04-88e9-c722e578fc2b.json and https://artists.proofprofile.net/proofs/artist/35fdeb3d-2f42-4f04-88e9-c722e578fc2b.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 0x96e233d6c6f9d9d9f374b0806b3f5cfb0a7d8c0e2d36e43a5ebc7f1c8c3a302f. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/FR2X41856432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632fbc66b0d8ea3c30ed4a7818569cb6e366d590db97dfb04b0ae7e6d998d440. 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/FR2X41856437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aaabc5afc6779c823abbc1d0585a0524aaf3e2b2de7f30ef658a964e380b958. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/FRX281993251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4661531f2c3e2eb7377bcfd9b75b2c78921b1a111c1a24e501fcacf67d79c4a. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/FR96X2041417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf280c6ad21a03f60c20a71e848bb54850d94140c5475501332cf1158d49bb67. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QMBZ92065592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2a48fc45c9331ef79d490e311dd6286c2b93b2b385ddcbd83ad46ab049f4db. 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/FR26V2071759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3028204260fbbdd4e350674f8f00a328839777b2d11b3be8ed4609b8396f3308. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/FR96X2144713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e120fa96a4edb01429b27fa53a21842b27e60226633aca75584f51b72266d2. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/EGA1K2401197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc883b71b4e7540bff17a4b9f346b011e22b89099e993b9a864eb1b9723b8f043. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/DGA0S2488776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dcc58a5d9272ae7fed2d63e83af30feeb6d587b827fb7b549feae0f7c509b81. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/DGA0S2484190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9c48086ec662480f2d58c2451d724038532650909604fafd71e87f569d21bf. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DGA0S2488777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25eabecf48aa574ff85f18f78dd9ceff56f54206d532762f27394f6d9aa14410. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/DGA0S2487742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72dba8a66b2a6a123d31648d3740653dafc3c47619d104e4f0d33ff3ed87407c. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/DGA062528744.