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 0xb2d0189fad43e112262585061ab4f459eb363a9dce4e806715fc4dc33089672a. 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/6d1b1e01-cc1c-4da0-a2bb-fb58186ab390.json and https://artists.proofprofile.net/proofs/artist/6d1b1e01-cc1c-4da0-a2bb-fb58186ab390.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 0x70b32f535accca4999afecc1d8eee591355be5438228c655288a021b2ba23d58. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZTBD2332557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f130a568832baf5e591f348b42ea59f309bf42fa391378cbabc49773643fb8. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZWFG2325814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf658781cc578e9d150063b596d0aa047cb118e0d3c3171296371a2f572f6660c. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZDA82468634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9a9d07c736f00ccc7eb137a99c250a6f99d08f91a3a90c2237ca717f566a296. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USANG2460740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8710f96ce9423b1b3fb9ee9bfb8f132a60eb27a04b3f08041a2ec625d48f5213. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/CA5KR2494429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2702a8da07421105400f0761de3718e57cc28ad40ea1ead6fdc76015df935865. 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/CA5KR2511758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799883da796fa37ea4e3addefa8bf961f20cefad2c0bc9dbfb46aa850ac9cb08. 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/GB8KE2503828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2344e260224db455cc2fac4a5e32a571f9b378eee62a60b883a09a69c166d327. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/AUMEV2538385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a45c64f239f1b9b743026da89d66878e602c20fb1944ef324cbe0400b4f286. 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/AUMEV2538381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140a28d8ec05e5f085b19b57448b494d46e861bb6637de2d99458738a9cdd781. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZK6L2525768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb213ae6f25ff107de5fee400ff15c02a065fe26815c77ba5423e20aaebca472a. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/AEA3A2565488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85687197dbc75e70750f4b494fe67708d904c651440fe144c3f6c3536179268. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZRP52528360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742f4f9807ce018ae68cb5d3789f3a8b45f3f4fb335b25206ceabd06352c1d34. 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/QZRP52528361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee6723a168fdec7a0a069d9797478d0364d601c5d1be45bc8f2a07eee0bb30d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFE2587814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4546d9b489ce460512c669f24b8be1027f74f241a153c336c048f4a756957c. 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/QZWFE2587815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935b141ff878e9c94d11da8e8b55fa3fd93419c1cd99d8845e5f74a7a81c9f77. 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/GB8KE2522556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd453554bb3e983e458c260cdeed370fa367bc65fc5d3c263636dcfb6da2723. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/QT6ET2530976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b07582bf6061ca1867710d179e514563cbcfdbd5bed64f6314b22887d171ec. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QT6ET2530977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2084ce888eedb6c9bfc7e8615a7867037a287d6160af6f3cdc6a4ff766dbbda4. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QT6ET2530978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763ea4c50987fb37f78fc517c2d7292057b6156f1bfaf9b8e519b021ee47b698. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QT6ET2530979.