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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44fd3ace52d1ceeec442e6c5fd87fc5dd35d253832f4107e25442871726653f. 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/690ca8fa-91b8-4f4b-a727-3a53b8b9fc67.json and https://artists.proofprofile.net/proofs/artist/690ca8fa-91b8-4f4b-a727-3a53b8b9fc67.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4afd710a1fd32f918ee8b6dd2fa9c760925420e2789b2fe8bddb759e591470d. 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/AEA0Q2306519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec8de6f48fda6ca470f17c445ec7fc947e488f5286ef1961d89127d38bb4cca. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:30:16Z), 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/AEA0Q2309484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9728b37570b5514bf980f03649b6af6a0e7eef3f617f8f1085d389f487920eb. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/AEA0Q2355904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94bf44490ea371a7cc20073d0d5a47e6daea40ab41c5a5193ddcb9bf93abb3bc. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/RUA1H2410932.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9eba1d9f86d3b9155273f772a2f9ed4b9550f388e366201d9fc4750305cb207. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZMHL2498374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3721e74ef9874610af7493ffce8d0e09da9f766a8fcf584670841b0f01fab9c3. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZMHP2451030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb64fe0a7d9bf0f18a14f18676be8c39faf2e5c8d0bc1f4cde3acb9166c97cf65. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZHNA2552247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb35363d5d5943679fec1f5e4733449a633c33d54c0668aa901aa1e30a1f565. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZHNA2552248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d121db7faebaba0466f468bd06d3577672eab474c751be4d66e70fe203ccdc. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-20T22:01:54Z), 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/QZHNA2552249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242098d832025f1bf0d6722342a93871c19173e09ac2cb8c49b7082c5912140d. 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/QZWDE2417677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94570bc4d1b3b38051df35d26b052a342de59f9bd4bb0428bfcfc3e568a32b70. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZ5FN2519991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f533968105680018cd5f1e9f9e8c823eaa503d40ec3c8d307a08f0569ba64f. 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/QZWV32440847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5acbc9deb63dd3ae2650e67fee1cdd5926cab6a5a475600d6cb13bee5a0735. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTBC2445691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd24790712eb354b93e9a0a68ef85015ea9a8fda9a49be9577fabc1e82fa634. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZK6Q2575674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9cd2762f549ae989fff1a5a6a808927449512e6302306322765260777aa44b. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZTBB2404855.
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 0xccec16c6f5d6c4d75a858703e2feebaffe8e55fbf597f9ee313bec3ae2592ef1. 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/QZMER2547542.