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 0x146940aeec0ad931a08e06f55c478846a45a41a8600250fea4863615abe37a16. 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/c5b5f0c8-4912-4f3f-8c39-96d0d99213a5.json and https://artists.proofprofile.net/proofs/artist/c5b5f0c8-4912-4f3f-8c39-96d0d99213a5.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 0x79f6d455e453103e1f5cbcaf02bbcb6941ab5e73d1c3a0cad0ce7b0612b3bebd. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:06:22Z), 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/QZ5AB1771277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18b4109b0f70c8efd6d043cd67956ad408ce5376e8a12f185046b81c4cd3a79. 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/QZ5AB1771280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a053646a88f1e51be5491136c532cc969b27b80f21e5c959f350b920ee4a781. 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/QZ5AB1771284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c20ccbcf57f2c1b6800770b39d594ce1925b47d3acd3cbfdaff30bb6e07700. 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/QZ5AB1771290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52f4ca719fafc757e376328a79253f371e6cd15d4e1b016830ecd0e94c64e31. 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/QZ5AB1771262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdccca0b9a8dbe18f4b9b6409c6b43c81680355168cbfccab646b1b0e5fc7dec. 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/QZ5AB1771263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444c442c43af54954c6ffa3ebd81459a619ee9faa3aa880c6c3afffe72e415d9. 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/QZ5AB1771264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c631ec3138bfd3c129b098b9fe6fa46751fda71d90f89166167ceb3f6bfc1e7. 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/QZ5AB1771265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1779f8bffabf56b9b464567d61e491ec9709d28c9e7f62a313b4f08ed602b4f. 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/QZ5AB1771274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddef8a821a3648923e6faf9edb3f7de9a0f11f5a3f05cfe74eb8ccc22e062b2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZ5AB1771276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1c9720ca7133f8de0b2849c0bf6af6b9a1f22df373421491afacfac97a1373. 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/QZ5AB1771414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb991d6afb3d69dd5ad889b4fd2d3459f41c836724c188cc4850567c6c7ca2e57. 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/QZ5AB1771415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4a8b4bfd417021c1d459d5d18c1dacd72cb00925dc0a73628c9acf5817f349. 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/QZ5AB1771416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056275ba0565a58b4c54827b67b030188397e8e112b96e176e4a194a8f4cd5c4. 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/QZ5AB1771418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe60d748bbd684ceca02497ce43c2df6fe5f6f1df821a63e7caf7407ee420744. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ5AB1771419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0392c802ae1096005ef81424c821836d151d38f2ae1febbc0935ef791c8a33. 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/QZ5AB1771420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4163342a850e8e781c3dc42f33394d06d651f5a5c54fe5caf02daaa8dc1f8e9. 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/QZ5AB1771421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824976cfe8f21cb1f4f5b9c0853feca63d83e74fc94c27b95795d034b4200662. 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/QZ5AB1771423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d446e01f525750e86808cbaeab731aee666a950a2314b7e61516bdf112d8004. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ5AB1771424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830fc6d8f4799724137a3f0865dc2b17f21a72f2b9493abef1fb46b1d77fec3c. 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/QZ5AB1771426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b76f4e2a99bee01fb48999e9d54974fbfc343f741c0c7c813b9234d1258a7c. 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/QZGLM2487021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ee2c9061beb6d736ea3b72ee5a76b6d5cfcbcfae924617ad171d139c9978aa. 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/US7VG2408492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45cd4578e9a554ef7801999eb5471716f91beed9a4599d7efbcebfdd04a93cda. 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/QZW9L2269000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5ce069513a3e2ee5a7f1b6f6bbe59d2f788b43f592e460d1c8ff082ad668ae. 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/QZNJY2240072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386d4139b89f53f016d42b34aed2ec65c35ea06240389595c33a0ef75170e8b5. 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/QZTVM2145563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33814b6d8de766b267927524f6743411b5e61019f39b7fe0a25de22cc0cd69e. 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/QZ5AB1797114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8ad0694ac203954774a1ae59e3035824520933b05783af3cccda486126acbe. 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/USDY42061521.