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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 0x58d9880264319ffa65359ac92571576dbfaccad9dec39911cd3dce078f33e14c. 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/2b8a13d5-cea3-46e9-a561-3236cf5badb7.json and https://artists.proofprofile.net/proofs/artist/2b8a13d5-cea3-46e9-a561-3236cf5badb7.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 0xc34485a02bd77706c2b7d29f62ab449d4ff0683ac82076688d70ae5e82893788. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/US4XR1224402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf054423ff5e469929748423c8d8efc9018cc09e5cb6b8f0882d018ee12f11efa. 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/US2Y71522009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254c8aa6db3369f90662ec8f4bffbe00c4c517cbbdbbe16e8e7402836281ac29. 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/US2Y71500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ac6a481bfb75a33c7794a16cea734977d49a46d45c4b5f851442457ccfc010. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/US2Y71500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506f1f31ea15d6740f4ba606625a2df58f8a459bbd73d66caea6432a4c75ed63. 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/US2Y71500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05cd50440fe698d9b36135fb0ee61115ee7a3fbbc9d2beeee864f1bcba315553. 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/US2Y71825201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578af8cfcda57c60d95328367642bb553dce9c386a0d6545a342ea1b2a2b8f99. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/US2Y71825202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156a4dde1e2d7cdc2750506bab06fd1edb133e4ba3004f518d4ab9bd49fa3486. 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/US2Y71800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3967203a8ea4ce0773731c3958d7bcee92316099b0ebfa858e5c603a4881477. 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/US2Y71800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f93d08769984120c051a5b575cb65504b1d9e787a99d0e0b139e45639335e19. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/US2Y71800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a21e534e93ab44e984b406f40777bdf19cbc14f7c80634001bdcc6680423909. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/US2Y71800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350c01dccd6801b7991399b974a3948dbea9486218ace7383f7dc3e7845e14e6. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/US2Y72000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fe884aff261b755239db119a4a598f87cf7b73004b9819e277479f864a8222. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/US2Y72000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b008ae086d0b8b79ee971763dbab04c93e781181cbd808e25ee446d9b955c7. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/US2Y72000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63fbe48f8da01278198f4db877f5412f9b720bf2234febb779e96b78fcc92b7. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/US2Y72000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d1b417c36042625e0ce29051c3703853bc7c1f21b7d646cc31df0bfa43c0e9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/CA4KE2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47558e342cf401a7aba8da08ddc52f7e151f1bc3ad91dc30f50a99bfd8ff1581. 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/USA2B2402083.