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 0x37f45c6a8a78ae2ff2ae0d653a0dff6f739818385cb3da0dfb9ef94201d85632. 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/33b29a49-68d5-4bdf-bf4e-c046f7b5ea3b.json and https://artists.proofprofile.net/proofs/artist/33b29a49-68d5-4bdf-bf4e-c046f7b5ea3b.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 0x9ffd8fdaebdf0cbd8f5557050af58c889883e73e6f2cf9988fc7ced57d2689d3. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/FR59R2202059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e796350fded5c0192c390d4a5df6ba662a32135833473edf99126de6cd3585. 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/HKG731568107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c31748ba21a737c9d29f65f26245770272df309e4e038157257fd77f03766f. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/FR59R2342370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391997052ac26fbaf0ab537105d3d47c7168816cb756dfece393df0fbab6f7e9. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/HKG732299370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3c8ce6d31b69264164717bca4277c72935dfc429df599fbf420f4bd7a30463. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/HKG732332328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea16ebe58bcedbbc7f9b079f109b6f5ed0e760f680c67c7b911da86f8ab3af96. 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/DGA0L2366991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903d4837a2fa929beeeaef86b6886d0677dab01b3c97c3031960249ada1b37c9. 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/DGA0L2366992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffeec7bf12b482b7f87226845093cf95feae214f2b19b396e16ea306fa6577c5. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/DGA0L2369646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102a7dc5f94f54b596d0517ff33993b4ecc7e074e971f6459c2391c7f9ffdaaf. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/TWDL72308018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17105577f5518742d78b0046d80445317b40a06eeb994d884cc0fe7312ec36d. 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/HKG731670942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x761898019ce792c4fa05bdda382d6bd4081612ccd4159c078ab8d999e2223364. 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/QZZ972339848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba53547d6844d8e3c82b3ae28fd91332ddaf30a726d6ed7534fd4820eda0e17. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/DGA0P2317872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ee52256932cbbee53b31b355fec7466505928a8240fbac1338fce7c3adf64c. 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/FRX452439444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650bb0baa4ad6e510646ea90ea62d2aeae145f0d2294e266139fd0bf7cd34664. 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/HKD012523513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151350c1e7ff755758775c9465662e434c0dc47c58dd96ba15aa860eed702431. 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/HKG732402312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0acdc588a2752fbe420f0014ce7537efca84b418d479acc3f8a90813f75eb4a1. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DGA062465828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc5e669ef5e06813c572c390d608ff2836d0f3c6868b3830dcdf6c5e71dc784. 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/DGA052454119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88409db697ec56ae1e8fe6bc3c8b01fe0ab3399d233b5574471d2268d51a6876. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/DGA0H2415975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc2a2cdec93ff7238063e9d5a7489e60e5addec2556e2aa34fc21cf5505c32b. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/FR10S2587429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91cff4b9b7547f6605378ee521fdbb5742b7e892a0d76da8ecf38e9df72b420. 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/FR96X2531433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be66a65a4660d451ca144602858f3abfae74100284a33bfd940f5f4eb2b24a3. 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/HKD012511364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88096b962043ba75bc7614390ce69b91c85707e86e8ae5eb9105fbda469246f7. 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/TWDL72502648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814f7f77755dc5fc1c408c79172ecf6a585b10cc6906c4b5f9302cfc2b6e5334. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/HKC992325106.