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 0xb207b131daf01aa39795b80bc402ee6c30237f8b6e871a2639308f9c27e25121. 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/71e42cd6-e86c-42aa-b6f7-4005767f07cd.json and https://artists.proofprofile.net/proofs/artist/71e42cd6-e86c-42aa-b6f7-4005767f07cd.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 0xdadfe020333423caadcebbc184dde6bc12f3495b40073f4bd5b6c974dc76d48c. 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/SEYOK2237417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa96ef84b4e5e048345df3e4527c28f765fbe239d4053a3ee706f5d3f01a802d. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/SEYOK2237418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65311b0cb954fda4822892aace8886a7f77a3627d777c53729ebad85ca1b4a0b. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/SEYOK2301122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1895dd4891b1f4df4e98c7c1a12a611b481e30f67851140723fa86cd5482c6. 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/SEYOK2301123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98953bb14c9e60c5f872ead0f069a49e79e8c70c92d8fee1a858d15a965b8168. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/SEYOK2319455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413e1231dd0b78ea429925efaa49567edc921c5668c8340926f9b931b77e373d. 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/SEYOK2323121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c95457e095d2a0cebb83a5e5b115c2162341dc0d5615e0e13eac6f60ce430fd. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/SEYOK2329593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4241e660db460f0109464dbb2987639917ea524223337674dfc09531bbf75c8. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/SEYOK2329594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409bbf9a0e5cb913009a7728846c6801692ee97cd8792d263a39c7088e830dce. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/SEYOK2336117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130bf00fe96f88a26aa71f420e3c1a53ce58961779c8c9f03cb9c4670f2da99a. 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/SEYOK2336118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc45978798285279beb7bb444b6c702d35c8f8ac7856cebb67ba90eac90cb82. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SEYOK2405879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d3f1c52de30a5f40ab1c32525faee7e686f1d0e94b8c2df128d61725991951. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/SEYOK2405880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45567bbbd9d9e6ac80c2a38db7bf11b87522f1e7aae929585c5d0e0bbd289578. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/SEYOK2415747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe741ec70ba115d04244a853db2f3db6b0edc43e4a48ac3aab3dd112a24bc60d7. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/SEYOK2421841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cf473b6330eb141f8e8e78d768bf7a3aa08f9fb9127df902fe437671fce7ca. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/SEYOK2428037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e6b6ae039231705d4ac4fc644ee727175bb82c82e8fd5dad4f4779bc7a1349. 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/SEYOK2428038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0998a110eab7fefa318acd879458b91a667336615dd57c89f8dd549b390d708f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/SEYOK2505106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd824e5e2995038ebcb5d798bfcd77b12374e00be4d7a5b64d8c2300e0bb80761. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/SEYOK2513532.