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 0x466dfc0daecb965245475446b55585e2788b0ccf54c4322f32c64307d13519a0. 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/4004f924-eb5b-4bf6-a416-4cc6cd973752.json and https://artists.proofprofile.net/proofs/artist/4004f924-eb5b-4bf6-a416-4cc6cd973752.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 0x75770099f55fdcb85b66e6562400b1cadfcf9bd00b0c5d304d991c81f4dbb88c. 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/QZFZ21921745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d04f4dd132588c4710f62c444529901091b3b0800c9810211f4b0113a912059. 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/QZFZ31914005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe90232cb60f638f2d86cb853d4a3c1840b120431d87943d05f428ba7f3d27a5d. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZFZ31942217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ccffd0d626d928b78fb1b1ab11bb6f6ede480e0287f87a2905ee64915f4682. 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/QZFZ41942896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe938238573d6a5e4df3f1b8696f559a1dc06d4de65c233f06c09521faf048fcd. 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/QZFZ41945742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x726f2eae9ce5b6c2535756a291416be70faa831d0d6229fda43e05b664d623ca. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZFZ61940849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35ee01906c6608fe8a22086f8dbe4851f0eb83ba79c0076b90cda28c7c79bd7. 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/QZFZ61960363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53461e821db6ffdd79a12cf0917d92ae025aa43e19feb193e0a3ffc70ed7aad1. 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/QZHN31929893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf992d864c11b5eef8c090a601875a74afefda97b2f25e11c6fa8c33436052b48. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZFZ61989320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca342896915a7205ff94be68f5ea0613493dd66e6b6d1c1a99833f24fe9e22ff. 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/QZHNA1934801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70fbdd2a1fece69d46e3d60196dd5e41de8b9e267131d8896cf6e7a0ab27f2fd. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZHNA1936040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156c5ea2bdefb2cfc6001fe127d349fb4dafa8b1e3ef5b7037c0bbc56ad6890d. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/QZK6P1975674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46b6e9c4fedafe80ea811f948af254471c628622ec83ef60010e35396c69275. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZDA52062522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x218290f8e3ff298cb02f01425f3a421795b2372fc9a032708e207c993a2c38aa. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZDA82078077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152233a9be2e8b828952d35547d89972302cff5422aecaa69ad344fb704e456f. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/QZDA42035113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd753563bce530af1f9db5cd73b225a67a136efe288cd389910cc1557bd4dbd11. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZHNA2078934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db358dcd5a38dc6ec012253f54d4edc60ee88d179f264d8ae3e78af1edf2e45. 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/QZFZ32197728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8600f757b457c4f4af7b20ed5f3b2b6796668e752376fddc783420470afe79. 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/QZNWV2107981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6d0e88a368ba468e14c4c161554e8c34f529e9c908705cce226b0a0b9d7003. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/TCAGC2226317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb47172fdc21d7f0b3db44deb5645bcdb38de7197ca2933a0d290a269e638ab. 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/TCAGL2272286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2686be1666e92a3d3ebaf1ce3e6120b8f3e2b9393340276b92316b330f7f2c58. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCAGS2372169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835f8f4d6c30f28a925d853a0890b3591395336ce29b7d5279ca1ea216f8ada6. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCAHC2311347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b47331a475d1362008691d60137d091c640e9c7bf68f6af0f87dc9c01c2f75. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/TCAHK2303662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5165f47763f7ec96dcd9fc3be59cac6fa923f767d502654970ce3f32d0c32a83. 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/TCAHK2313317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54be56fa3de76dff1bbecdc1d7d3f433ccc38be6e04c000b62ad0df0a5fd2df9. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/TCAHR2393797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892777a19ff595f411d4d08dcc85b65c3d85f2aa8c802bf27ad77333a7ac36e7. 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/TCAIN2411413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98dddcaa34c8440790a88c8ee5eee56b1abe234d009178c1b33f35132c9cd12. 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/TCAIN2411451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bca4fe0b01b8d0870364e28c4aab9d21ea43832db5030c224827041124386b5. 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/TCAIN2411458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28bd73066b68926f58c902e0b8da409480a4f75488f33e509e0b518e5323810. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/TCAJG2538515.