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 0xbcaaeb98af9ae82a5131cef189677b753cd53043df37395d42a15fa66b925ba3. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/53c6c9fb-f8d9-4dde-9b71-458086864937.json and https://artists.proofprofile.net/proofs/artist/53c6c9fb-f8d9-4dde-9b71-458086864937.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 0x46d4aab7ee58686a57c4783b9f62cdfca8d32737735f9d233ab17e7dab79bdf3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAGG2295693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38875b892260a55a4364a581147f2c86fa85f5bcee4bb374a38bc8a274f81e6b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAGG2215576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b3b72971b884061d467ec350d8b9cc64b1a37d3f36d09b81f48e62bd80a5242. 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/TCAGM2210927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6415ba836ba466f84839f81636efce6677fb496c9002cd5849d54d15e22ddb. Chain 2 (Bitcoin): anchored in block 957674 (2026-07-12T07:50:41Z), 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/TCAGN2283946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c1153ffe6c7f1b0097f0ef35aaf924fcdee6a0894acd4fdd7cea356d27e1d9. 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/TCAGO2208505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96220ff3ddd20e8e8a9d50d8aff939927e0d2dda11cda5e0ec668bb5426f19e. 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/TCAHA2324636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe4feeb30ae5a5f5cfbc3a4ff10e94d3f3393815221f716ffad7e0602ea87d4. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/TCAHO2309951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac2d90ae2ac839c5393504cbcbe01712b38e6154b7a3f1b61e9c1ae702a51d4. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAHX2448635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x833eecc17bc67be221696f95244bc82c8c52a9bc51f45d84bd6eba0bf37813d0. 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/TCAHZ2400105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c2a5e9d3086c370b26f460888d17b08a45b9daac7498537ecae7ab075c1f2a. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/TCAIN2413733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e1a9ec609c08149cb4269c1ada7f72516c4585ef2a37c34cb99bdcdf4f4185. 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/TCAJO2537928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f72fb45a55f7d7a6831bc7ddc2e1e0b02ecb9f516aeffcfc8ebdb48c2f1f8c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAJP2574066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1264c94ba260ba79e3c74b8d3b6719fe524a4bd3ac66add766b6212c147a147. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/TCAJX2596546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa49229794de44ce46c0aa15d608e2ae69de43abf995c38212b8a08ec0ff5303e. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QT65X2561123.