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 0x2947568e9b4d52ff509e401c1535a070328fbca25ca10a4e1185045e2939bebc. 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/7df52ac3-9805-4b75-be98-587c9181ff02.json and https://artists.proofprofile.net/proofs/artist/7df52ac3-9805-4b75-be98-587c9181ff02.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 0x6499c81106c88cc0b87ff263f2e5abe3da3be8493aef722556a218d9593c7794. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NL3TA2108102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71a50e1f96b35cfe2c70639b4497c954de6b4e7f6ec42d25d9b0158b5406d8d. 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/NL4AW9900702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7eb958672ab41ede0f494abaaced99c08cb1e572f5fc51844b0a1a391a2a3db. 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/NL4AW9900302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8d0e02922def7fb50ac0e5a1bfc6ce97aaa0645eb8f4965e59e9ece9a92809. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NL4AW9900106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698a2d795947d7aa35225585365e45413cef5a92f16b5959b429292e80ca9bd7. 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/NL9DX2402602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547404ba4577c530e41249963b17b645ecf638c27f4754dc8002691a90ae7f5a. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NL3TA2433002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbcafd012e41d893a01eafd37a8beb33a8dbcdf797dbe7516cffa7e30ea74602. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZFYX2484616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6793196a506aa07a79e09ea8977c1815606b2308fb5f85c66a8ccef7f7022f3c. 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/NL4AW2327304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff893dffdce1fe7f0725dcd34db3f00923d5ed21a9e9ee8b106d9012a4e7932d. 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/NL3TA2330002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ffcf0d589c9ae78e4207a02559d16f0d62d089efe762b052f7dcbe7b536e05. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NL3TA2330004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c11861c9317ac8df1050139475efc68dc3e4413828942759b17f5c835d5dab. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NL3TA2330006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39e33db3c6db982168cb7e1a499dd0b2512e7782d9c28a6c76755e96d1102cc. 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/NL4AW2326802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c0eb14659317552d0632d6230841d58e1bdcf6c0898a3dcbc100f9713b44d2. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NL3TA2326802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489e0f42f19df9c7fdcaaf343c4e53e80e36a9cf75116db38c22e7299e06fdd4. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZHN72370311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28bc7656f0be428eac303231df3d2623e8a218770587e9d1a8bed849e76afd6. 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/NL3TA2325402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093bb010bc332fabe254e443729ebe3f7380b6fb80156af1ccc5f15cbf80a249. 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/NL3TA2323002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226ffe4e6553ba66f68d88d76676003581c345d07dcd78ab3f236af54267d134. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NL3TA2208002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafdbe5ad2d54da7d1d23766fb2a4487502964a6bf2dcc8c3c06dd75ea66621bd. 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/GBKQU2276653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233f7fa41b0875b5adcc5a55671ce5c92f7a243098ddb8fa18df27e229572ca5. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/NL3TA2203002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a9c8d5a1cdb4ecac59ded97d754620f4f71fb4b8463543f75ff49c8a1cdb1b. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/NL3TA2109702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827b3eb54f63d3489ae174313ac751b08dfcd7a1a9c733e28cf08ce365e1a4b6. 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/NL3TA2109002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69752fcd76e6b2b49fed5bdb73c59e0f49e050b9101cd7bc50b915d8db9269dc. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NL3TA2105009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a0c740ea9c7af9f8901bd86301ca3d811bf57cc1c5f53500be8881c9157076. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NL3TA2000027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe651a142a425ee67521a5b2921984a863674968e7530c3b3451ce709d8d85d6c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL4AW9902602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d43ee153493831254c52fdfa4bd3ec4331a0ad6c41e88337dd296bff43ad8a8. 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/NL4AW9902202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28035dce3e6065f4bc1ebbbcc78e865ccfe1018e6fc54c17bfed68811ef84651. 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/NL4AW9924016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6c493148fe815faeb25f33b5a385a0d442aeb146f4ca45cd21f7dab2eff7ff. 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/NL4AW9901302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1b3f9e6bb8966fe80763d2b5b8e493ccd06dc0cb0df84696f81b48e7443a24. 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/NL4AW9901002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee52d4fc07ef35573eacd9a26d7096739ca59822110e5fd573cda05c4543f5d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLG3W2400047.