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 0x0bc96a3e35ba106875b1e6141e7e464995754c66e5b0184764b209fa35a11ea2. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8c5e7317-fce7-415c-80cd-323b32a5b608.json and https://artists.proofprofile.net/proofs/artist/8c5e7317-fce7-415c-80cd-323b32a5b608.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 0xc4f842f42621cda1bd039177c52f8948a8b08febb3c8e25a1c5e7a41f619ac19. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/IEWCX1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b6385805a2306f17920bd563876e0900e7a87f4ddcca17a4ee670bcf5ac8c6. 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/IEWCX1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8983463685381d3823fe879bddb0353851c1c0e85dd15ef14c702a38d5d3bb32. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/IEWCX1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86aba3a27841b64f4c06feea744bc028b8e1829c474e0ac21aeb5ae6a0e3271. 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/IEWCX1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8a018893822b7a646cdef25a2ed589d1999b4142332c6deb5de07fc4ead89c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/IEWCX1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5fa1abd19d9b0ad11cd886fff8774060849a7b7ed67899fcfae1e98bb8636ad. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/IEWCX1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4f0205b21c223118773f2c9ab76f9a6183a64ac532edc64a9d4eafeced3359. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/IEWCX1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14cebaea159fd4e3caea90233054f223193ee1facfc5a3fb42979802366d1d3a. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/IEWCX1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8813923ed768af955289bc49dd5311ec993833b8883ff77ca4dd0daba663af4e. 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/IEWCX1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79370eeb5b8ceeb018d5a96576509ec24d353a3c9ae19850fcad952340db799. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/IEWCX1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ede897dd73051228dbffbb49d6e8f3fae77eed0216d90542f5e0124f3a11b5. 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/IEWCX1800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d70d885d4c238123f7d1c323cec01cfcaa2d4301dd04b08cd831ea5986c745. 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/IEWCX1800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf34addaec327849bc57a4a9f3126a38b5e2a50691613446b1154e231b08eb2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/IEWCX1800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9095917d6b439ac5cb082798739eaf28cc30b97db2017246ddec0c0ab3acac27. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/IEWCX1800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48863a14ed5305b34818cdefa4ef4e55f9cc2cd18309700c02558bd4928f427. 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/IEWCX1800015.