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 0x010dbdce6debf9e969126309e7165a6c37ea5fe3e676a07af0d8ef9a7bd0578c. 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/cda0267f-9811-4397-8ce9-f86388541ebd.json and https://artists.proofprofile.net/proofs/artist/cda0267f-9811-4397-8ce9-f86388541ebd.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 0xf7a1236144f2f5c3dbc19ae315fff0a60bcec93adfdc1397cb3ea32384ae056d. 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/QZDA61821874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e4469a66e34d60dde2e0deaf8cfef778c761a2bf4cebda6076148f7722669a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QMPKX1837940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01580aa5d4a9e838124dacb26ca6e80f9e07745922217cb97015a6710c6af0f. 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/QM2PV1826827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8102e6f5b39df77f3f6c00ce6abcee1f8b0cf8ac6328ee22ab173ba1962950fc. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/UST8K1874877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf91e5e42a02e8b2c5d8a42d08ae279a1f409fcf9cd0fde093c4418bc539140d. 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/QZF8N1822275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aab9f03eef027c995183c0205044b8cca0f0176dc7ee0ac3a154787b0577314. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZES91889730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf73190a349f83a3bf979c5e64ca37d8e340903a464299a9874e089ed49b8fb. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/GBWUL1829269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f7cd223d276158903d0b7e967593aaa8056574fdecd5f2d181478e0fa93c699. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZDA61942300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a10b75979282f77beb7b3cdbf4019a1b53963746c1807896bfaf23b24d457f6. 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/QZFYZ2036928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51edabb241a9cbb62198842a11badf71eba105dbc1b8b0d64d6145330963d8b4. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZFYZ2036930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc0b085bf6ed11919ac4ff101fe94f256a9cbb9748bd8c5abacad30ba0aaf47. 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/QZFYZ2036932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ac03fe3dbf80d8b94f22dbd95d52f958fa8516b74a37dceb9dd720cc8a6897. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QM42K2023235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93aa2c7c1229dd96e32f2668df51d9d50f072f28443824e6a1a92d82e12a2343. 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/QZMHN2088949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375659869ab276d959a4c0ddf5fda9d50687e248460cdf4a641e77e7bccb4154. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZFZ22108228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b579e79eac81dcd702ba0c49392d14831b300e609d0df022659f3b478f8d38d. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZHN42156017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0fc9143a5594b421932d953f251a5fe721d4f2393c4e6fd31d2c7c200a16364. 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/QZMEP2130308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1b334e490336c8bc21a7c6432f28fb52a3a06a477f1b164761be05d9b6ceb7. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZMEP2130309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea765ccefaba47264cd37c129da467991017c4c09b40630988c7a5c0742674b. 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/QZMEP2130310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72f0017881240114be5b8c4bf03469df8a0483cd316afa8b4bcd158adde1dc1. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/QZMEP2130311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x930dd9053b83806e41ef81ac6f2c51d97ac1e21d57b550b085e5454e38e607d7. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZNWZ2163676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83bca1866f324ed8dc4f24f2ebf642a2bb3734a26ffac5ea9243d0cfb1e8a390. 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/QZNWS2231423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed7151a7c4692d94086c87e37c4d339ef4da5bacbc20c2bbefc6d63e3c29a08. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZTB42252279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3973de80d6e2db06f9a03f7b03cdb50495248cf5849381385fd84a40e002619. 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/QZHN92380833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3246643f506b5fce7230eb6140353b882f8ee30951b5f57d66f7c3b53b292439. 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/QZK6H2340881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ec5f5b8a9fc30be64c646541e5d26c36cc33f1fbd4039733462519d39f4f7e. 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/QZNWQ2303390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf02e667488cf5db11571e814edb44637fc87dd1cdffcab4d25938ee491b5436. 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/QZFZ22458433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6635fdc7388713c4f3da5413b4641bb28130914e9b4f00bce87dcd4a2389cbc. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZ4JJ1842052.