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 0x3634037e384108316bc6351e548253393a4b5116ce68ef6d3fe145ac932cb94c. 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/28579fdb-f366-4731-a2e0-a24acf128039.json and https://artists.proofprofile.net/proofs/artist/28579fdb-f366-4731-a2e0-a24acf128039.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 0x73f8e72525997335fc34589b733a137d97667bfcc254230e41f19e6e3a1bc653. 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/NLC262100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7a44d041dcb41aa35c6eb77a155fa77785dae11fc538494cf7e926cf79d5ce. 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/NLC262100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19bfd23a15f828cec18382ecddc468dbbefcef8d1ba0a42256d5e8ddd1387bd9. 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/NLC262100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d36d0995a72ecf9868b77eeae0465db551dc89758926b2755c89d549129db37. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NLC262100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628628808c5a5abbc227254f34b1206468ee20e5ee5e435b66c11e9daa0e6888. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NLC262100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1163fca46952dacb881e3e3bdd15b54bcf835ed2103f74e2abea1f694c95a4. 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/NLC262100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8ac6b465ca1ed5773c5aef08d5809178c60f9d77d20b113db995de5c92511a. 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/NLC262100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811e1d5595bed35c32130ca15bca426239a20c8fb6c6ea34f132915b57f4f34b. 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/NLC262100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e3d5afb4ea80596ceb06662971909b96e9c7b79cb559753c8c9a772bef6e3c. 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/NLC262100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02651ffe374b5ae8173eff956eb93b34750206f33dd0e0f23fd7855c4707b4fa. 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/NLC262100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73353d525a355657132ab45f2d2f9d2dc26b32f2e7fb0e4af515da7d33d087d. 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/NLC262300033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8388178e67cec831dc97f998eb4a84b61e5173d3e56de6c37f1cfd518563c54. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLC262300034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6798230c50f8700d6bce71c435b7c54778e63a655ae4ced1623fb51f29e867. 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/NLC262300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51eb8301f7f6dfbc9ee8ddea801ef5be970da3db3e164b877c9abc3e8454d562. 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/NLC262200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e118840e06445d07e3dc00591b0aa915f01e340564123bdcb0b2885de4068de. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/NLC262200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e3d5afb4ea80596ceb06662971909b96e9c7b79cb559753c8c9a772bef6e3c. 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/NLC262100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628628808c5a5abbc227254f34b1206468ee20e5ee5e435b66c11e9daa0e6888. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NLC262100010.