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 0x70f996a26a431c6bdd6153536c309404d977b7e05e887cb760806646077df7a3. 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/24249635-b9ad-4e41-84dc-53278ddb441a.json and https://artists.proofprofile.net/proofs/artist/24249635-b9ad-4e41-84dc-53278ddb441a.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 0x8d80380a5df4ba6b0749cdf699624371d78565da903085e7c758fa3f6bb265d3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FXQ892200248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53f3c349aff2bf798ae29b6580b6b3b4c9517c5a4ea2b4fe6ffa79cdc0fe3a0. 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/QZNWU2389661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39bdbdd4672393b3fead81cee83786254b7815023adf2bc88e552e74660f27ac. 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/FR9W12309181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c413c09ae71e5a65acfba80f29e3d9cbf7fd0e872f7e1e6ccdf9af5919676b2. 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/FR9W12300549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af15d2a32b0d02c1e772e16a6220cefc5f41ed49be6002d90f145f9a10ddc55. 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/FR9W12235821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9ad0736d49841fdd211fce99b1947e7395573f8da2d435d2bb027f149b28d4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR9W12149910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609c79958ac00f38c3f3ff5f46d38326384e137aebd055d0cd787579f184b1c6. 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/FR9W12209659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5903ec391098e8e8ddc14fe84df88b2cc2b9096dd176c16d2cef8679831abcf0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZK6K2029313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552afff53c56bcfe6f680edbb6531961ded23dba5ec06f5df1e76d8a89ecec93. 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/QZHN92055091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0edd61884f39ccab8ae4455d46f5181844c9a5df39b982d4f1342501cd3349. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:29:49Z), 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/FR9W12001396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e92d911d53a5d1b481e6b386ec324054bebff554d30f11deb9000410d8542b8. 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/QZK6P1985583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f39054b4cd792df04b38a163a554ad9459b7909e9e9639f0270dc64f7621c7. 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/QZFZ31970083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e994975889b72c8a1d5954c3a3c8a89310015f6d2b5b2816c7703ebf6d0f735. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBMA21947197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5ea38bf13a93c9845f07d49f3b377f48776e78c6beb4531bc9be1353309ef1f. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/TCADH1724016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ed313b93c54396bdc43fec4c0c43b6e9e622382303bf9b6f047356027a26d3. 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/TCADH1724018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd271594774abcf1a4575798928a8d40150d1c9c88a62808a1dce5e06011f233c. 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/FR9W12432009.