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 0x529f5bc1a7e119255e6564eacf70af79882c2c25e01cb8e06d35427c9bc2fcb5. 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/a93ab366-d62c-47e6-933e-a9742d65a12a.json and https://artists.proofprofile.net/proofs/artist/a93ab366-d62c-47e6-933e-a9742d65a12a.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 0x1377461e6486de47d423c7d9d12ab79076c63ee023e6e0e7eaefc99271263036. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/ES71G1416985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06006dfb2ab2818191bb3435f124fe5862217b5aca6a738f46acffae54ae319. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES71G1501123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91eba9371ead3a32255ead23bd958703f0795b8319a69b49f2d3ea430ba338d6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES71G1501127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499a2f976ae2cbfe212b87a8456cfb044dcac55b8080e391a7a647c41e665355. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES71G1501129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80589ec1f1b6d07cf28bc4d8b3536e3d295e56b6d4941440eccc9b8cd3bb6f9e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES71G1501133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2787193ec6885b12ad825fb0a3b02e2ec8481ef08369cd2cef9c56cf11c159a. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/ES71G1901292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e84791af859781268a495a98575c46de12b184a859a669dcd7a52eafcde3a79. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T10:59:24Z), 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/QMFME1917225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35cd993cc7b0f55acfe5cd46b7af553760499af75c52750e5447bfa63b661a2. 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/ES09S2000236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c80a9d509d27ad10ea15d2ed9b63c7fe40abc1a302f190ece8ccbe4727ef56e. Chain 2 (Bitcoin): anchored in block 958495 (2026-07-18T04:39:02Z), 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/ES09S2100323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73592f6573690ea2cac772b0f5802277e12b4c4850d38f0a3c44b7bdcf01abf2. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/ES09S2100326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a21aa9d3a6be1d534a8d26eb48eacd277b813ab4e1c09092436e2e696bc897f. 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/ES71G2334187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe19cdd7c3b4e3ac96c5944d6c70b4cb86d20000899e86a19d99968ee26a9891f. 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/QZNJV2429715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x466ead3b98e2cf755bb60b2f4efc31f2d364ec13af4c4e9f4b68d5e30eb77fe7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES11D2200788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12659e34de4691d52c3bf4f0995ea9171229d8b1cf9fc360bb64f06c8021ece1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USX9P1438260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5348d6272bd60d3f97a0a2f5406a1a3b7f860ed7a4739cb5a8942942958e6fb5. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/ES7002150601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb825bc0ac909d4537edcdfaea75714dd6a95eb3805619591bff119991d8891c7. 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/ES71G2426413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b7ee6f4f316ef31f73a2f703ec9aa1b2e68886c696618b911bf411da3a8ee9. 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/QZTVM2434366.