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 0x0d27e8475afce34321099ed7ec5caf1283dcb33c885acfbf625faab60cd6c22b. 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/e4918119-e7d2-4719-a361-14b36bb7247b.json and https://artists.proofprofile.net/proofs/artist/e4918119-e7d2-4719-a361-14b36bb7247b.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 0x177dba62a6fbc7632c6102bc2d8bc12b7fe9d6f0375f6205d09f41babdd3b113. 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/TCAEA1985661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09da731424de7e38f1e901e2a788a47bd01d86e912eaf9066235ecfc242fd75f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAEA1985667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb36c9bf81970b2b51d2d4db295dbf7c9782a56616e3e28f86cdb902fd28b42c. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAEA1985669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6232e3222bed01b7d01521b14d3f8dd8de4585dc7fd85283fa902a26ed37408e. 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/TCAEA1985670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f16613ecdd8e4e8d41844e3ffaac71e1a423f3e188a97c61817e87beb19b171. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCAEA1985675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d2e4b6c1874d86fac0e3882bec436d5b3a1470634496aaf83205423b8629f8. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCAEA1985683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2243d7cd52c8197e382da987b6ad6b277e6ca72aa30d8cd8a322b111bd34d1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZ7FL2050044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776a5be5a1eeff50fcdb53db49d441bb2f6409234591a8a26b82021ab6b07f29. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZ7FL2050043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77d25d6546a6bf9a839b1c6494ccb7c112ec37e8da2275df303627c341977ca. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/QZ7FL2050041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521329ec63d39701a0c3c6fa32f73f0017122ee4aca4cf7d7d67c56653fbf742. 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/QZ7FL2050040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656b8b016b4ae63f250b54b69e82ef2da6b5f8c9d2ba39cab25d68127d124742. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/TCAGL2273747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435a813d77b70bac3fd9fece09aca047116316612405a4efc7884831a458e030. 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/TCAGO2286531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604cdce5b046b29b4838aaf2bc4079cc0c4900f58f1848ba687886e4207b4f39. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TCAGQ2278051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db7baf09cebff4240517aa0f6f885ec4d3b2ed6f881200ce5e19d29b0902249. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCAGQ2278084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe833ed2ce2c614a5e6481c7f8e2bfb0e5456bfb9d62c4a126a9cb8cfd324c7. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCAGQ2278088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84807269e2aaa33e09477082223be9fd2b7e4c410450965ef8bbb8d94e99e083. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/TCAHQ2320904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7553fd2861de0046fd29ec6822872987ac272252be1515eec1b19c447a2b11e2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAHQ2320936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4afae563c09bddcaa47ce34ff7fc53e562cb591df85c6395190ffeb00e9c574a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAHQ2320950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960da5d56a344fcdbd96f95aacf75a8f5183388182e3e9b3a19acd601f23eba6. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAHQ2320960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b9f3c8d7d7cfce2cdf1dd43f9722887efbe98db7f76eb6ffa4cd5cea06bbbd. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHQ2320987.