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 0xec8fe1997128440fa1bae947d4002818556ddbde8c500d127d6425344eb2b1ca. 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/0b2ee799-0865-41ba-8df4-2458bbe4dda5.json and https://artists.proofprofile.net/proofs/artist/0b2ee799-0865-41ba-8df4-2458bbe4dda5.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 0x674dd9dc1ac92d2040dd01b7f727154aba6e6da10e96a39d2a0856d0dd5aaaca. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/US5NR1614602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7291c90d6362c1e4b8de7e643eca4ebdd27a4b46fc7c37c4e2606ce7bd5107. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/US5NR1614604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0e6bf879591b9a885396b19955da3f123178208dd46c4aa3de08b50a202795. 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/US5NR1614605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1a7b005736ad84f84fb3dcc86d9bf41a489233e463dfc1ab53bcbdb6e82048. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/US5NR1614606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bd05bb81a0c4c864b1ffd860563a9e6b645a63f5540d320c2b191addabd1e8. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/US5NR1614607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1aaf4db9e18cd96f15ecb27032fb847885f990dd3aec4bde4ef955a68f85ccf. 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/US5NR1614609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4bb8959f38f2d1b3b8965ae2d8b0f9793c57aa67ee33c9eda60c88bac00901. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/US5NR1614610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98aa14e3a3b90c3868f649b498ff69edbe76a29cddb8319a8bde928b62ee84c6. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/US5NR1718003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3c1399179d3eba68731be265a38d057c5f8294911809ba0f92d5ad76d44980. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/US5NR1718004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50858f1346f96feab8467fc47f358fa5c1cb728bb763bdd457b5173b6fd0ab7. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/US5NR1820901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeca5b3e844e8ba9648e2a80b0fc00329f0a0ac74c43d0f7bbeb3703d5c9193f. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/US5NR1820902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23febd6e57b6b69fc889037da9793cfc66b566d2ffa742e4d293da04fca8ae33. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/US5NR1820903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9655320ddf26c6209a6fbb05b4c0132de7387f59a8c04c320f43e5457637a904. 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/US5NR1820904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e546e880445abc15f2cdb1c85d4b6642c8c3f5b7c762dc2ccc482a563bfa4d. 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/US5NR1820906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85db7754aefaee89c6f4ba0a7e0891583d38e2095d0c9825d2b87adb6b1d3448. 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/US5NR1820908.