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 0xc3ef78be6ca586efd7d2ef29b9e62215f7134a19b27f9e552ede5a3c93ab029d. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/74799637-3380-4c6d-af88-8946efebead3.json and https://artists.proofprofile.net/proofs/artist/74799637-3380-4c6d-af88-8946efebead3.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 0x85e0093764ff4019d84a01b628514207ca7ff5e47ca260a831e31fd7e27255fe. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ITIO32400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2367a071cf47d351f7572eedc63ead3ec850a92964aa6c16d8c3509f70ab3e88. 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/DK4YA2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdecb1ceeedaee14d319eccc1ea1c979be3d3693b83b3e754c67aee0b9a1c907. 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/NLT2H2401573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f03b1d9c43879da411a03493c37b701908bb3689765dcd120e5986b40357ef. 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/GX4R52381004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d02d121eca7bf49f7340a539f10c121c4a1b4c5023f56179277e067358d083. 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/NLT2H2300714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b62b1c76e13332390826c5adbdfd467b4d232f2b9421eb7d599848afa328c6e. 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/SE6QE2464467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf446d86f862d1301dd6d548e2f861fd92d1eedd14d1eba07a3ce706887878fa. 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/NLT2H2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df780be273d078a0de7333a6f7998ff347b131fb640174b981501a5a65d5f41. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ITIO32400174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e43e502e34f49d1907376d4450c3e3e7ef9657ce0025974f377ce5819300d4. 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/NLT2H2400964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f1d4816459982ad357511904a87ce9649180c4ee7b894f61a307c84c61f32b5. 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/BK4DA2427966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0f686fdda5da03cbff6c61553e34c69795b6e2c824bedaeed2f30312d485a0. 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/NLT2H2400698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64df0ee7ca929a961f989b22b7eca8f748586aa6d0a6bd92cbddc7e90ff4fcd2. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLT2H2400545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896322cd6fcc02aaa8c21e02d0f0c3e69b6580cd10bccacccb561dc1d7a63848. 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/QZK6P2433320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea2ea8da8655a73a78a6562400c318e1ab9740dab25774d63f7a11ad63a0035. 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/DEPY32400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd1047205907f713f9337936518799b5ec36215a7a3a17d9f83a1fd91cf0f9a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/GX8LD2424574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab25797a54be8e403fd1ff9719eb65897e88ebe8e5a5776ba87e9e829603904. 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/US38Y2404628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730d983abe3f3e4b4f6fd5fa5d22d262ff0020aa9bd9b70517ebc848e2db95d3. 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/QZZEC2301903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9751293607be15e137b145ec3ddacf4bf562c0c88c8fcb9a9637d11313bb7202. 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/CH7812361412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aefc8ef3e13439a5c50e4ebfbfd84718d503910a86dfa0a8447a55262219ffc. 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/NLT2H2300575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab740a0fb6521c57a5eb08ae855b7fcbaa870fc0f7747d8de7ed0ea6fc2ac081. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZXLZ2330212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1030bb000a922e1a4659cb00e6956fdd8c79b836e20234abe8665e4b2fdf29. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZTRX2362878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276acdaa1c9cd90b806b476f6da85f72de318e3bffec8fbeefc13b75eed45a77. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/NLDD62300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bea4b838f5ec370de342d2dd964d94b0b475e11bac9f5c436f0f6e167f5cd61. 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/CAHRE2200108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c1488ba0f85d6e78e7a2ef9899f433f05ba221172b0ad7137109503559034a. 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/NLT2H2200054.