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 0xa229d0874aef8f0d31ee66ca6b05fff0ec80f9d4961520c0269eb4b6a614355b. 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/203b413e-e5fb-4e4a-91b7-8f313947274b.json and https://artists.proofprofile.net/proofs/artist/203b413e-e5fb-4e4a-91b7-8f313947274b.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 0x9b703c79fcf61d9f9685157737f191be0d87119af16e3f49b33a58f6006b6dbf. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/PLA811800134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d91bdb7c779fa343b0ae25127fe661d09ea835a13346204a0e5db0d89b6a3b7. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/PLA811900344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c77c6f9c2203a66da63d5a86bb8c055c91c87ef2198ee04cfde6855dd9e2e7. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/PLA811900410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964b80adf50c7c5d989102ae129c83a310de7469300cd92beb4bc6d213bb0bc1. 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/PLA811900408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2117eea03957b96de7d60a20bf7e5b3bfbf19eca404ae4a1c6672cdc2d6082d. 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/PLA811900403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9862dbbae502cedcc1bcddbd8f2bf18477602c605bdd6fcf985bd84ee6a65c3b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLA812200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecaec84df2169cf38aafbe3d8ebd3cdf9b94fd1c9717ee175d127ab9e0e95ca0. 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/PLA812200051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2042bfb94ca7c67e154cd7d75bfed4515928b5f9009b1b8adac4d4da2d04eb. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/PLA812200048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dfe1e37235a72f9365b1b2a8300873e1eb4d4f7c6a10d8654270e904b742a95. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLA812300138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e14e02255b4d8964789c83defa60ba3cada98c419b574e38aa64321423411e. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/PLA812300141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a501137b1480f7c4baacee3ca3eda568e480e9cd6986338e9d961dc8e12b404. 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/PLA812300139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb342207e78fa50eac1ef4ff91186285e6f15551ac2ee543b6eed8325babf19. 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/PLA812300142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85e528157503bed659150ece54be2fe313cec07d0029bfc37fd03495922a8dc. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/PLA812300145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c69087ce62b808f72a4de2d5e528fd5d9522eb4586c87d33b2cca7b38a642d. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/PLA812300146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3165085b9228eff60ef44657259656d436b207dfc9e6a915b6bce4bf14e461d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/PLA812400091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe819a17f45079af4d541aa2136c98c5a841716162ff2b4d7ac55074f73c8ee5e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBPVV2003853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b703c79fcf61d9f9685157737f191be0d87119af16e3f49b33a58f6006b6dbf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/PLA811800134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49fd1610dcfe38e82ee3bd8315fee29e00733db602bfd4cb822bc28f205f23a. 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/PLB822300244.