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 0xdf77a5fc6345ee9fac21251c28522e5a96534b685ac568d7a91ae3d4cfab1417. 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/2937284a-8b2d-4cd2-aca4-b3cc9b9a9b3e.json and https://artists.proofprofile.net/proofs/artist/2937284a-8b2d-4cd2-aca4-b3cc9b9a9b3e.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 0x0e944242c9d31a24c0caa91b190df705e37eb43fe52a7aa7f89e7fdf5e24b844. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TRBDO1800210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa553d657760f0abf3e41cdfd06a25bb7c9e1def44b68686f4355285bc5eb5906. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TRBDO1800211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd389c472f554f4502ee916b409502fd355c5f6725360d3e567cb363f92b8ab82. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FR10S2460684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0ef105e1f8dd4b3c853185b6a8a7ada5d01b7969ed46154c285a2397a9c3dd. 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/FR96X2433230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd799b96fd27557e092e9e84f37907b9d213104438df05af8884eca757dd40d9c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FR96X2433234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fd5ef8321935c096770eca0e03c515b7509934ae2e1908de052ff2b2dd3cb0. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/FR96X2433245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4788b31196901be9f8d5a1ce58c589fb2a8a7f1bedee86637082475c5ec26e4. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/FR96X2433208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa910f3a93f7648b52b612b6299a9d154f758f9347463f01925420f0a5ec92085. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/FR96X2433209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b01d68a7bf2300cff8b215dc99910833c4290821e091d5c4061f95a6b17251. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR96X2433211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc04f583497f60a2c1bbdb0b5cc347ba467f17219a39a22fc1480be8c5e27369. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/FR96X2433224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80a3e25c85dd2f089580d72b92d3996c6b400c9c520a1eb2151689719b5e5ee. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/FR96X2433225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d104a61a490356a423400cd6fcbb21e26e5649b751d00e21baf300cd2410da8. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/DGA0T2435724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeefd2d0018cc945f595bb2c0a73a23fc470281ada075e813b120912d3988561. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/DGA0T2452114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8eca03319b0dc69aa1ff03b48ae7bd0f052d1de49c36ce6999d20af0f337cde. 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/DGA0T2452106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc765bbe052c9511daab95b361cba8ff02bb5cdb7ab64bfbefe87043276ec206e. 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/DGA0T2452079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97377c2d4034be17c31a1204d820f14e571b40892573c40223ded2ad0963f074. 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/FRX202557419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c188cc1fee991330c045734ff4805faa3f5bb4caa49dc6f512664444488c763. 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/FRX202558437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872501ef0ae5c4e787544af9f185a38b3c12d8628ae8907dd01770f0ac5b26a0. 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/FRX202557411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75766e9eacba279acc94f4af52861312a374aafcc47735cb4d60549faea593ec. 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/DGA052563054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcbc99e239c60733152088606635a14fa4f6b079716f487618097449ef5270f4. 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/DGA052565093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef6d9ed4124c6511a1b6c4388566edf7ab79122274670eb8a0b41ff6df50a78. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/DGA052561491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2188292d274abbd6f2cef591916226b01f44fa98d5d9ae10aed86118ae17b80. 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/DGA052560915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd67050cf4ea42340daa6cca821f97bdd4431c69c35639b051e0d5b679d377f66. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DGA052560921.