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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 0x6def4175abf4984c8414efe4fe5696c0dae9ab81dc020516386591aefd0e686d. 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/6e1c5f8b-01f4-456f-9346-b5b53d7bf1d4.json and https://artists.proofprofile.net/proofs/artist/6e1c5f8b-01f4-456f-9346-b5b53d7bf1d4.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 0x627875fdd6e766734fe22e0408c0c4228415c9a065ffc9215d1b70049dd3d87a. 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/NLS5K1900121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70de86be72d28bfbc52abbdb825187a91bb18beedfd5ba49a677691227689da8. 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/NLS5K1900104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5ea4780273c76341ccf844c0cecf998336ba769068d9b2655f55994fe3695f. 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/NLS5K1900122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c091396f600b12f68c219ea3592594ee51649ed87138b6049dc57c06cf2d52. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLS5K1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53bd94d6f02e4786dfc152ec6ace6253ac323e9363cbe859b4a186ba85aca549. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLS5K1900123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539b05ed85fccda6a9d88d7adac24e92bc9fb2a1c098b825d01c6f8e53f8cc6b. 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/NLS5K1900124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e196d9197cb3afd8083859bfd8363437f216a897f43fcca3e0262bbdf9b5c62. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLS5K1900079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10536fbb0a976b48ece485626b49524c7489b2033ba8ff5fcd87a546d0a8254c. 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/NLS5K1900102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c606fee2e4a955e7e59fa5ca6a3f94130343836a55808c0145300d79791a8e. 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/NLK2U2100471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a04879259dc0dbe1b9cfc5aa7f0c77e493bb16b451a16a3af36b5e36412704b. 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/QMBZ92273885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b3150c8080ce4ad7bee61ff38c63b4678b6848f0df660fa8b2cda8aada13fe. 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/QZK6L2183077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd2670b4f30f1e9cbc58bd3c882e02e80869fc8d6f4315cee97c398251b80fc. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/NL3BN2200049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62539ece4ccba4518cd977af8800a8cb250166eea2880e7f5e4980e19ef7dce4. 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/NLS5K1900177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da4c805900ddb9263ff7ccbe705e3446a5d87f56891e1c492204d9329504f68. 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/NLS5K1900179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9919515eeef889e069208266f618999199f50b9ca372c1a8624ac01834e60b22. 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/NLS5K1900178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f7286b66f1d2e57b0eb406a39f8862548825b891dd0d144848183b1ecd9fee. 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/NLS5K1900166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658d39dba8ef20e0f37327743f6128d4e554451b94c135a10578c920fa687baf. 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/TCAFT2165640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f288d5777a4ab715e8764d38abcca629176226f3952eaf1c2623b37b711489. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCAFT2166141.