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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 0x7e2bcf5b2da707cd4613b68732c3d9a9cb83848efc29e84a49ecd4174646943d. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a94e0b5-4e5f-47cd-91e6-f6c0cf80ecde.json and https://artists.proofprofile.net/proofs/artist/1a94e0b5-4e5f-47cd-91e6-f6c0cf80ecde.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 0x53cbb25d885813f5bc2782690b7e43b136374f575746377356db4edb9c2f6497. 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/QZFZ62333670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d51ca50963cc27efc2f5e5d6c41add2267157ad7d2fb68838a9f6b16f4b1f33. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZK6P2373041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96bc082712bf3e87da5fc28fbb26a1f682b8e7e20a1f40d06c8d8eef25a265e4. 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/QZMEQ2300857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82ca2ca6358b418a43893309ca785cc76d066858e6f0619bbaf436deed07fd3. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTBD2403469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f61cc6e735a37becd05235c2a9ac0cb3ba16001ddb946150bada2e1b051472. 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/QZWFP2468088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f51421ce097686bd405e01ccd9cf007bdf5023c680b0c8ff4295dbd6079c14. 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/QZZ7W2493837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fcde0043bb0ebede945fe575f2a19162cb13d60e2970f43f863720a4e62a207. 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/QZZ7W2493838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe42d7b580b28bf5232fc89437b00503e7c7a6002739147cc43e2ee8a4bb7db4. 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/QZZ7W2493839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53338b5fd5a9eabee04d3425c1cb0484641c0d97beb0ca584740dc4e378eff9. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZZ7W2493840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9849a6b2fe48f3f70c810bdb3bd7e02138d975448e2ef49d5c1a288e5623dada. 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/QZZ7W2493841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5720c4951746685916cb40b27b8006e26cd4b9dafbda5928b6e859ac2928c5. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZZ7W2493842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234ab946ee695f184872f27272f7095b25ef77f59fb2453288d9463a49d68748. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZFZ62507724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89466f5a14c4081f5439b834681918d55e2d24ea121d6ef57611118fbf111aa1. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZHN92587283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9ed5a74677d3b20521b56d4ee7981a8331478f910b4bf43efff1bf723ca1f2. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/PLC062543760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe402353cc4aecd996668d32e44dbae7e410d1bd0801228e4eac98c7a07a58781. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/PLC062549136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1f95f35a3690b4a8a1f049504ffd3a40e88fd1d27b83a9946d783d754e5e5a. 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/PLC062509437.