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 0x2537d4228b05da2c1b54268118069fdf749037fe56915a8bf40895b750423ead. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1f696314-06d6-4702-be00-7afb2de67f90.json and https://artists.proofprofile.net/proofs/artist/1f696314-06d6-4702-be00-7afb2de67f90.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 0xa2d8070d2e3c36410e595e325bff905920fe596910ce50dcd8f67a6581622f3e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFL2465527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcde1ee5fb2a297e437742dfbe77e051d5893b5935db020c793690816b1c21b9. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFL2468716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25341e30b41993b8f44981285bfee78dca4e851ff8171580842529e050addcba. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZWFQ2471317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfebdb8c545ec367111db13a23f847e55545241b3f25ffebd535d5a10fe1fb2a9. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZWFQ2472945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc9c6798d083c2a9e75904cfd381dacbce3ffa193af9885991261d6157c5e90. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZWFS2465884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ccd88c7a8abdbfc69cfecc032692fd12442bf1322cc3f83a01643c0ea24d043. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZWFS2488571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2654f1cc9649e3f52fa9d28ae1a6a56dbb56b6340e14201802a3c7935213e1. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZWFW2492326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8c947ba3368a7287d65003d434f386f981aa0e2c793c2090deaa1c295a0196. 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/QZWFW2492423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8de7b0bf9e96e2d2d7634862922def741f227468bb03cd968c8e6471c4dcbf5. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZWFW2494821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04396aa66d6359d870b355158a38117edfe244a777d75843269d4cf42347e2f3. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZZ792416133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc19addeea00628a8524e7a01c0cb4b403cd9bb8197cf0bbe33b7c089b585274. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZZ7M2421551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fd227c9bf3e6561f6708ebb11c2d2d106e746b928ca4be78a2e888079df19a. 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/QZZ7P2423237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e2d2fe53692774b96845c3c34b706dff1510fe4024e1a26a8ac689a9b7c187. 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/QZZ7P2464231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24be66fa0d90b5877f8c8cd1b160c94212ac917dd152d5d19281cd2ccefac53. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7P2465840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c50aacd886f1bc7c912a76e04acbb65a1b90970fdd4e2490398b112628c717. 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/QZZ7S2498852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ccfced427fedeb7bcd3d576ea6023ca21b4155bd139c77ca376f77c9c96230. 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/QT3EZ2411840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf35d7b090be7cd8e929b040efeea4d6bf01a76a42fd367f15a09b9dfbebb741. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QT3EZ2411841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x494888f7570a5fdc23dae748d894ae3c8787dfa800bf9ce08fca6383f5cf7cd9. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QT3EZ2411842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe387f85bbccf8499cbc42900469de41f6a2f52c8d07a5ecdbf4236b93a978d17. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT3EZ2411843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf9a34e425344590ba50b888e7c36e77327fc963b1d079b656aa23b7e821221. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA52500418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623748cf99161350e63a08d1baa95c61703a2f0bfbcb9f5edc39500692db2b1d. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZHN32528364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c4bc0c5ae1b7c664bbc15ded59d1da4256f4750e2abf9afdaad64839357476. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZHN32529887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05988cc57ef7e4e9a5736492d8a8a430844d290b57a2b70a0945c9a254694d5c. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZHNB2567598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4292096dddc36f2af9e88faa1de86db9be81cbb3e7891060665f11ccb614b9f7. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6H2580738.