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 0x6bb4eac939ac1b7ef3e1e4e7fedc969418ac03e9e1b4f52894b1683cc8af062a. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfa2c234-d8b4-46f2-989b-197d30bebe3c.json and https://artists.proofprofile.net/proofs/artist/cfa2c234-d8b4-46f2-989b-197d30bebe3c.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 0x8025499e60844e923c8b11f6df4ff36cee765abc6d74a7b5898534e459df615b. 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/QZDA52535989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a80e39e5c457a606e26db258aa91ecde8c40547c1ed59fa0eacaff318c14c30. 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/QZTBF2456911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf5fa806a9e5056730decfbdcfa06d045d80aec753be8f80db3dab8106e2826. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZTB22470048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd274ba45fccb1cba807fdfd0a89ccb6e45307ac8a09a3826c8e07fff6597f6a5. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/GBKQU2470824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1348b1ff6afda28c882136740bb9eef8676acb417161e300c971eb84c8e763e. 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/GBX722400253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aeac1a8c7754ec83b941e2828459e18c886c7d4cfbb392f5ad3c9fecc441e35. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/UK2X22300224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1458805ae85f5f4bbd9c3bf2d529d9f0eae4cca110dd785a9abe032b9ac1a189. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GBLV62304680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc75311b75d9ba65b834a1ab0c8992279e1a5ce7c4dfeac9b7f047a4ee02fda0. 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/UK2X22300172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7041ea1cf6f5463f6040d577357088dd3d808bd120f8d0e187ed239c3172bb0f. 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/UK2X22300121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487fb54d6dea173800de609d958ca991b04342cfcf1f356bba0ccbd140ccf48f. 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/CH3132300444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc05e2b224d9894e6ae5a8ca214a110742e9921c675aa96195b61bbd4d066390. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/GBKQU2289780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64424092e69a4da26fb4dba7fc09c3b49787990493ddc840711d0117aa7a3fd0. 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/GBKQU2280994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93fe22e90815742f802c96dba98655afab8628506dbcf691180645e0addc98f. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GBKQU2253075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc7cf3192c21bebda4615770411d1ebddafe23387c9e65b1647168f131ff28b. 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/GBLV62134030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf786dcd9033604d377f3df2d279e5c1906a28ea8ddfe8c51b8db3f80a83121e0. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBLV62134031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4acaf6d2542d331aa8bcbbd8f2e4f10d8006bbdb62dc80480320c57e5264777f. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/GBKQU2197267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7283bd09c616f076957de6aaeb31c6f825cef5ed358a4726395ef71ce4974555. 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/GBKQU2169061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x337eeaf49cfb18c0caf8bc1a2427d24454585c9b92b0fa487d8fdec021ee0b5f. 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/GBKQU2122146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924c4da48b003139d11aae9d39662d16a90ca42d172ac5a3ab62475e9bbcb403. 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/AUMEV2028223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af64020fbece2559c56fc76c8ff5facfefac0ffb69d2c33fedf4ac6766c6201. 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/AUMEV2024935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7f49adb34fe048fd9f53adaa7f2f1907d2fbbe2b19250651cfc83c0d9d80e6. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZK6N2083754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5019f21801f78e1c6ae745c716226b4a3dfab403681f7fbd148c1da81e3316d4. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHN31958961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cce2aad6f88d3d3b637c924ea4989e0f72743da5cf91c81fdaf34bd6e0b5168. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/TCADC1795151.