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 0x3d735713a9038120c55eaccdee778445254ec2d030b494a0220c91fe343639b2. 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/b293a7fa-4c87-48bc-b382-3be65a647b43.json and https://artists.proofprofile.net/proofs/artist/b293a7fa-4c87-48bc-b382-3be65a647b43.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 0x7e337a11cd60eb037ca918e793f316aef4586829787a0e0a68107d4e19419172. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZHNC2322219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dde84662e6c6e68a038eaae81cfb02b274edcffedb23f3f2e71c0a30ac4f313. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZK6K2324355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be938529444416a6f306505393d2448b88b9aa8598ff15431a637e7239f1268. 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/QZTB72322163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ce7629ea5fef4202fdb02803f0ebcf18c70e0e0bbce06d6823564a0d6aa120. 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/QZTB92381206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb1a0b0218f6c9e2f9b5755dd97747afc0d4aacfab29d9ed48520e8b2930e4d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWFJ2307273.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad12fa308bcad17ba4b765b9ec58dc7c4dbce7ea0ce2a95e14b3b1b2664fa3a. 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/QZDA72407602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d57a8d453467dd996f94843685a1f5fd5eb95cc19656098dc98406fb5c31eb. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZHN32414830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77591b40405d7815e951e54a9f227e5f72c01fed907cd947b1f4b41afda7ecf1. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZMEN2434042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c725cb7ec241be405a257e0f0132977130a3fa4dab8fb515e7d4178bd25859d. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZNWQ2403855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74338da497607752276639c876d4b844ebc7ef0969ce67bb55bb8c1ca083c04. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZNWW2436429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7863a15492dec12c50162b7948d35d94c6f9a9271140e81fb246eeb5467f54ba. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZRP52450526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe969df5ef0ee80351019b88702dc7ad5ffbb0b99aef3f4a067e02ff2c7874395. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTB52473391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb632acd6f50cbb94b13ae3715cc348f00bd4387dee9926b2c8b68f8db60e351. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZZ7U2432999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938880dcf24e332a66f178034e546b9f0adbd27f336895cd231bd2c3f0f09639. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES62591420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fd441b8929d55d7238dd83570c4af70535b2f5b539ba4955c60a70e6ed8b1c. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZRP52511855.