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 0xaa05b2e255c01818d7d02de0504c1a141405de76033e75768c66fb6a0c9a045a. 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/3462d4e0-ce3e-4297-aa52-28d2bd072fd8.json and https://artists.proofprofile.net/proofs/artist/3462d4e0-ce3e-4297-aa52-28d2bd072fd8.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 0x6aaa79d9e59e892ef6d95d07e9f305faec31a1b31b4ad99332acb450111bb4af. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZHN51922812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35496c55c9f8faaf24b559a272f5cdabdac6b0a4dd68a9fcf775f4f129509560. 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/QZK6N1932699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e0c877c2f3a78aa1631c4b8524738d455497f17701ffbe2388f5f05ec68632. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZES72005848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e0c877c2f3a78aa1631c4b8524738d455497f17701ffbe2388f5f05ec68632. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZES72005848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeaa971fc301a2728fa581b79b64295ac72aa53c45a6ed581d36c7a9efc2b2ff. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZES82066992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83c13b5bfc55e4a87a304008cbde3e98c55d53c2dfeca22d6f0021fca01ecfa. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZES82066993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b2fd8e174bafb2c3f4a5b85b36b8f3521236e832c60d0dcba5354c4696e578. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZES82066994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82bb55e6de2720899b1af1a2c50417dc13ed3a91bebec7cc984be129fb783b1. 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/QZES82066995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c775d63dc04f4c58fed4d425b0eec2fbd268a2d3c64f4088a3975d478e904f2. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/CH7812067840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdcbb4da0196e5468630cac5c274c16fb73a36c22f19ebc0e8aeefd7b704b13. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/CH7812068323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeade66de93077517f7bcaf47d14bd387ae9dbeae8e0b063870646f704d7b26d2. 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/CH7812073618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b317c1a6cf6a7bd30ff538e09d894533594509729e72e1a6475db83fd81f4c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CH7812073619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c17838e970203c3c4dd735594955f6e45e88f770c13ea1c0f570a4c3af8ef6f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CH7812071501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc016f79fee70fa5cf7ce0f0a3f348a62e181110347c992c78bc1dbd1ebeba749. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/CH7812073620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdcbb4da0196e5468630cac5c274c16fb73a36c22f19ebc0e8aeefd7b704b13. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CH7812068323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5de287a842732204a177ba9aa0b81fcd175503105282c755b013a172c3e1e33. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/CH7812073588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2255f7ce1199f0e5374a058c23615e2330f21d787fd4cbd14949a06358f10d19. 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/CH7812178143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa644e467a1fc07f957036f8d542ad4dfa6737b337ae7c4a8e62b1ee8163869. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/CH7812226121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb4cab9c2f97aedff28b81fb6d52456e9644c46014763e1907fc2909f67c550. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/CH7812235900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d92df8224a042e82bea4fd51bd2106d351bb4757da45bff87db5b54e9d3d2e7. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/CH7812240511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2c8c21ad03ca43af1b07f2c684d3e33ab9c92795df1e04f31a5ff3b4dfefdc. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/CH7812352204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e78cd685d225b270b9f99bb4c1e4d753ce108cfe5169da8d239ebff8571b57. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/CH7812419226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f9a425d9725344a63ca3ca02edabdf475321fffb4710211266e5e0e44879c0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEQ022009935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f2a0a2ef44fd43a8c3a92741d8786aacb88193e3e8b93e8578248332eeb3c2. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CH7811819748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d6ed531ac72465a805551ef94af5b2272760bd19126c94765f8efdab803723. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CH7812219407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5de287a842732204a177ba9aa0b81fcd175503105282c755b013a172c3e1e33. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/CH7812073588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c17838e970203c3c4dd735594955f6e45e88f770c13ea1c0f570a4c3af8ef6f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CH7812071501.