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 0xb8bcdd90935a6d1cd9284144a76448791ebbd7212c8f805304f1c31513d716da. Chain 2 (Bitcoin): anchored in block 953780 (2026-06-15T12:02:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4629086-ce67-41de-89cb-f1b623ec320f.json and https://artists.proofprofile.net/proofs/artist/d4629086-ce67-41de-89cb-f1b623ec320f.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 0x520bb465b1b16c92648200465e3b31ed240ee9d3c716867a9ae51ab00f2ee61e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USA370580567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f9c7dd2db980569b92ad7ffd12ade2839de38d16a735ed4af494dc682ec4c5. 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/USA370580568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdcc4dc73cdb9b3cad5130c39b4d99ec1857139489e2eaf6162eba0abe1d2ff4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USA370580569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95b5ff0a4f98347cdf8f710805dfa46dde1a6db22818499a73b8e4ff5999b59. 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/USA370580570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa500e2a6f6ce021c785ea9575d2a75fae7b0b448998cb0df652e8fa66a1dbcc3. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USA370580571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3069f85c863eaf73db9e35256f0036efaf8abbad2b078a85b70b2be9f7a58a. 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/USA370580572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92914654fb56fde1497600560beab3136da7d18d3fec55fd50b094e06524eea6. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USA370580573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a198c228ac73883b0288f64ff418c210ccefaf39e6100ebd87e73190ccda71. 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/USA370580574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d4554a10130e6da1f3fd26d60ac0d6a7953f32d059fe07fa81be71b50b0b77. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USA370580576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514f1add62aeb55199e30a30190ff20df3202dc7180a21ef4d1cfab0a36b36e2. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USA370580577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ad446aa43b7f368e004434797bc1c2e77f62f9e430d3b224f967b7f522c53d. 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/USA370580578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f40e263ca908c28e983ad34eb8de6b25ecd1b720c8690b2c4334bcb3bb50b4. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USA370580579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16bec74fd1a6798fb659c119e4cdb021b1f8a977c7d7af7516cc7c0b5c86a6d1. 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/USA370580580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6c8422eeda465315f24dccf6e1ea33d6c13ccd2fff9fc15aae49ea83aa5392. 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/USA370580581.
Dzied Nora Bumbiere un Viktors Lapčenoks
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514f1add62aeb55199e30a30190ff20df3202dc7180a21ef4d1cfab0a36b36e2. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USA370580577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ad446aa43b7f368e004434797bc1c2e77f62f9e430d3b224f967b7f522c53d. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/USA370580578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56726fca7aee67229281632276d8f57273b47cd4ad60e9224cb22295dc5fcee2. 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/USA370580587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4751eac13eb934e283403d003620d732f3cacdffc31b6cf13b044a1d3690c4. 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/QM4TX1851912.