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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 0xfaaffcce99e13f8b07499319cce654324575bfd24ce867d9eaa59e581f24cda8. 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/a9552f1f-6e2a-4411-9c6b-7628af825b20.json and https://artists.proofprofile.net/proofs/artist/a9552f1f-6e2a-4411-9c6b-7628af825b20.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 0x092356739995d665518bb8b5e6b44c8c7aea969fc5bc7eab0bf2575623593a75. 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/QZNJW2376863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2832ee159026b60b23fd8f54d81e50fb33699ebbadc1dd39298cc442d6be2259. 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/QZW9M2281196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee129e01388471468591c75ef012c7f5e1dd4f546e6f2451e2d4880c93aed65. 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/QZNJY2184179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x092356739995d665518bb8b5e6b44c8c7aea969fc5bc7eab0bf2575623593a75. 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/QZNJW2376863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01466771d63a0a6c192c435b016428e229ebbcc0ead47b1d0af436870edb1e4f. 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/QZ5AB2447645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f24f3d1ff3376cfc9deabd8c90d158ea2054f2211fc60256371bfc9c1c8907. 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/QZ5AB2447644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476f774641d836e38ff6c47fea55b9799b95cc6b22af94bad8940ffbc5aa798d. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZK6H2101344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d13a6cf602fa72e9adc05d6dd455b6ca164a144d8bf266f3d818c9f9e8e39e. 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/QZGLS2292654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d473ad81d72e5e8e9d63ad0d04d023cf52fd143f091ff5359ade3a51138910. 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/QZTVM2129373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce5d35e93aa16c0be7a5d27e9d6f74ff224c3830e9d11f435e9cd5223f6862f. 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/QZW9M2446900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088258d9a973aa80588a78e73ab5a20dcda97b8e2cc8f976ba225a4bec5c977c. 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/QZW9M2446901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ded5df2ffa15c843416a3a8511a52e2f6afc9e0498ab6b4a569b7c32b14d0e. 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/QZW9M2446902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4980779f172fe1e35472952f24e804032dda2bdd7da16d60d67c07e71a29a4. 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/QZW9M2446903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98ea7711c13870f8e60ba890e7e786c9f2d72e179afe346ecabe181c1480f88. 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/QZW9M2446904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf62b74d763e79fa8a2a6d29a270a747f886e4f384f8c9ddd729d055eb5a2c6. 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/QZW9M2446905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98316920afec142a47d1be1a23998673a140bf69e7c2f715a9aec9e4485f61a1. 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/QZW9M2446906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e5f4b52828d0a8de94ad50663af6b7354df0277a59f249765286da2ab0b14e. 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/QZW9M2446907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9168d2bf0c12ab9318e15b362d1cbda757ac28b8002c012638e23829b9468a. 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/QZW9M2446908.