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 0x5fa3367ab2b48bcb3b0e474f30cc6fbec0fa70d9eec9a7a0073addbdc1885efa. 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/36f78fb5-5871-48a5-9529-708ba7b7b689.json and https://artists.proofprofile.net/proofs/artist/36f78fb5-5871-48a5-9529-708ba7b7b689.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 0x9dec24dbb8418a25625451d95112a3fc07dcef6a2f0aee7d33d61df614952173. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/TWCC31800403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30429da01488916858e186b5f4e0579b528244b88529ee3fd244642efbc3b5d. 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/TWCC32412677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6c04353292c1fd83b7d83b0079653f8fe27e008e494d0969b4bbbc50aeef52. 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/TWCC32404819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb43009fa31a6ed39963fff7637bd610cd72f2219a1e40fadf95e3ed0d681f2. 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/TWCC32403468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70cfa1823e08b4e61e7e9f078eb072d4fc621ddc1ac676c3b5d5a915e8c9afab. 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/TWCC32400494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd459cdf0d7d75defcf9991f521bc82777b09ab828ab5bb052cb385e72969d4c4. 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/TWCC32307687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b743b95a53d1608fcfc7fe636318c3e12dceae864486a51b931c40e56b88a63. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/TWCC32302865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe1982a8a4fb01d3afd3c9f8ec663f923c6424940d848094ec840a5b37934d2. 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/TWCC32302532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef68b8d14b1059eb6f937d29a4bb3892a6d9460b9650ee0f6c60f60f0a7f156e. 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/TWCC32300264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28dff58c3f21da26354f57df8c7b7c102f822128db2d6d971e13d270fc9e186c. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/TWCC32300196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9d2e4349e0315c2d644d83b4d4bf342c0b7f1b838bcbf29b8fa6ecaf661d96. 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/TWCC32206804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5374d02f9bc6227d0fcb74c24260dc69eebe85d04986ea1998bd61904d49f4. 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/TWCC32205197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e429ae7d63fa45465979fb885912c577a6829f73bc6cafe311f996562d5719. 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/TWCC32203057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54a5e1b390ecfbb15e5cba42290979682dc156904017886072e207d2573d299. 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/TWCC32202110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc0f3f23f0e4f4566da685e81e1fbf6ece4eb46201a98a6ef24a0406d94c7b8. 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/TWCC32200040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c74e5e6d267c2981069c7474e7f9bd7226a697641b364b277b135087e14a441. 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/FRX872180150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35bb53dfd1b4090f805cb3eef1e39b610ee1219ed3ae15c6b0898b2f2a567758. 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/TWCC32109443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff235c4d79ac8836373b4899b082c5d11303626756b2d1cff91e5fad27a613a. 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/TWCC32108267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04bd335873f9ecbdb848ec0d18e1570326b1e469b70a8e1e1ffec6592d9b36bc. 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/TWCC32107709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b8284ff592deee4d1bbafbf08778d900f8d4c334e3af519236d122a4c43192. 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/TWCC32107192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10dc3f670877a3d277dcfc6ef3e577352ddffb7f907bddc55b56af882d35c077. 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/TWCC31900871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064320a56459fabab1533345b4e643cd55d2a026ef99141ae288efd3e069c892. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/TWCC32010398.