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 0x30c49293813a22660f8b74e05e2591f9b4fd0582994f062d36871f8723d13450. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e43be8f7-a952-4cef-aaeb-82eb19c1129b.json and https://artists.proofprofile.net/proofs/artist/e43be8f7-a952-4cef-aaeb-82eb19c1129b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xed1a966619d7620a62d2cab795f91b8c6df4585bea4b52aafac5b94fb2c835b9. 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/QZMZ92347486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e1ece4803fc9cec9c9ca94f23fe384a058cb5b5a489e88fca9adaa1b4b39ef. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/BKZ092400196.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb876bc4e960bf568034beda48814e8749a78a12f5defd1b91f65c8edf6a2243c. 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/ESA112558041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d87958c04eae81faf1cbcfda9f5dd4ca25a81867c6ca55cd8042ac73607ca1. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZZEB2439757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa72e38e6fe8df2a1ae9c74c755425b14d1efd4783578253fd683d40aedce1a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/ES18F2400694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784e924547fa947aa21e43d479c3302c919adba76506bf5b55c002397a658d53. 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/QZTVM2449233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6b53d6fa055adad4527bd1620d718f22ab8270dd8b199f208ce54ca957a225. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/BCIH82403237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d4631465b4a23c5347f7bda3df86f2c8f7351e72694c4fb1f88b78d8ebd4f0. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZTVM2450098.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c734ddd13a721ca5bace231be90543e6b774074adb59d84c58d7d76bb864d5. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZNJZ2479410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e0d6b50218b8ff369aae9ec2833f495eba04f70739a059325e264ef915b9bf. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BC3PG2401700.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774531766f23c5cba15f669cd92222a980aa6cd3c217371f635de91219d769b9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZNJV2319707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf3c75ba5b90bc9bbef3f34ef0a8f73a76714297433c9fa600d234cae161cf63. 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/BC3PG2303081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b35891ffb75a0adbd8bbe9c3f7f0e0f1f4f80874bd22f0af893df0c39c4beb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM3DF2128049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc998b42bc33511d40d52a652aa8d1ad0e2c00dbd8b6c18e9797efd2db6ff74e9. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/BCLWS2404563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce3508b2d37aff2fd8d54173e98ef25416df0dfa3f5bbd0d7c8c8246b09db79c. 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/ESA112452895.