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 0xd1bc7dec0c04ece4f6676f378b6bd46d2d2caccef852867f6e67b057bc592c98. 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/a95f4e26-a0d3-4f96-b5d8-92f27aa7a44d.json and https://artists.proofprofile.net/proofs/artist/a95f4e26-a0d3-4f96-b5d8-92f27aa7a44d.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 0x88f5d07e73e3399755b4e5cfa81a8b13c4e37fd98ccb7d883b8afdb6686fa21d. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QM4TW2104969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0cf3fe71d0e63b03368291c3c9653d3b7deb5b6b9da2d0b8e3c67ee3a3fb66. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QMFME2105565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe891f580e1401126be1feb3405e9133d4e8244080416d7854a6e8ec9085920a8. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QMDA72128116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe891f580e1401126be1feb3405e9133d4e8244080416d7854a6e8ec9085920a8. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QMDA72128116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee144770cf51ea448774e262487968a1cc5cb090e8cdd0c173203167740c6ae. 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/ES65E2200387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafbea710319b7308de1d5e2d0e66393833e91feb80d5f7237d28e84392dd8409. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/ES64E2203453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc638f784acf9d1296a1aee0f51ba48c2d8b10661c9b782e247517e5349db58c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ES64E2205506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc833957fe9f2e4e65c2c65f09f24db83b365b775408d02d298fc399c2ec726bc. 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/ES64E2206362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf0c60f049064900cdc076675ef8a35f72facfc577fda17da84f27042d2513c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNJW2347490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46568c248d2bd1db735991eba8e19812bce79e07f66af927db2c20c48739e620. 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/ES64E2323545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeadbfd5066645dc035371385f42092e47ae94372bbec04e891501d029d69b66. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES64E2335163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeadbfd5066645dc035371385f42092e47ae94372bbec04e891501d029d69b66. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES64E2335163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b275c30f798578fdd2b42d2d175da32f2bfbb5330cb9205990e7ada0def049. 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/ES64E2450070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe63b19b96f182335a17e141a9814c1967783a85225f7cb22c16b7ac213e083. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES64E2458171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe63b19b96f182335a17e141a9814c1967783a85225f7cb22c16b7ac213e083. 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/ES64E2458171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c29df03ca0c1944690799047c9d3107d5a6e546aee93c19a006eee27911de9. 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/ES64E2476660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c29df03ca0c1944690799047c9d3107d5a6e546aee93c19a006eee27911de9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ES64E2476660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1ad99bd4655fcad88a5806c3e22dc356fb7b87370a37053f9292d541ece2a4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ES64E2482271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d3e7a113da191c6a29722815e99740d6ddac7790fec24ab04c5f73f5380eac. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ES64E2419104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8cc7b73c78504892aa92a81d4c19efb1368d7fe371af39aa53fd1eea50f9e52. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/ES64E2419318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01fa84a0f9a0cc2b87746976de683e542f9b3694e4942d2b6bee4066c27d1fc4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ES64E2500630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fdaf4d6d4ac6067b7f12996941d4cc7167a11a3dc52967533a1cf5f78de58f7. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ES64E2509141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627425911d0f5b091189c52cac17732cc5afc047a86f50025ad82a66ce795e8b. 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/QM4TX2216701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec66a95825cfe2d7b3e31ad5f226d9613bff8223825a439cdff11bb42c0d3227. 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/ES64E2311942.