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 0x44feac74ab24830777198157f4442ec8c7fdf52cbe8730a371dbc0ab642e600d. 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/01131536-399a-4efc-8955-096e5a3cc4e2.json and https://artists.proofprofile.net/proofs/artist/01131536-399a-4efc-8955-096e5a3cc4e2.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 0x958a024e5f5ed35255b69f5c93d304750cf653da6ae1533fad34e88c8225e720. 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/BRUM72300723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1236fb745c8f95a0f9efc1b347a83f498e60739e59a24e4f9c2ac6601d435a. 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/NLZ542202317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6633af824df43ac49b11f0c6bc906199b6fff7d09476400c53b8667a405c59c6. 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/BXIED2200252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54d6ddedd4c16351ee6783f748a4d3d685287ea7b7f775efd71c4a11db09e22. 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/BEIW12100338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafe5c586d8a371bd3e80d22d255c855a6080928106b33e38e6f47fc17542273. 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/BEIW12100287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a1d1f38a349a421663bb23a5d62b97ce69d1335a143fae755bf910d15742ee. 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/BEIW12100123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685b41f1a6aa210228c2152851200be9ff984daf0f21fe6bda9a5eefb9c9f870. 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/BXIED2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a247429a80bd5d231018a2d2fef816c7ee7db3bb37d853482ea9abd95aff5c8. 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/NLM5S2101236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a512d20b8c9f4bfe86a6784a3eefab83db26da731cd768421f634f39ea31f4. 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/NLM5S2101237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554a241a2a5bb85d868c5c81649912f47ce5c45ad7f12e5b610643564c4716a2. 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/BXG9S2000095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd1e83705707e3b6c13cf179c5cda31c75580f87fcf33a4a0ffc964a8e3532a. 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/BXIED2300047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc4222341c77f872d0d8d6082395e13d68472966044bbca431619a0332ac21c. 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/BXHBP1900713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593fb974412344240f8074a857b92f52152798027a86a10b1039c115d8902353. 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/BXHD52000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880ee23848902d431d75848885755a489097951dbbf4616fc3d011dba52ccb43. 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/QZHZ31956587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6681052fa44ff19cfba0f55ad76e918e9c28abda4b4302cc979494dca7a43cb. 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/BXIED2300315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c110b6b37fd62ca27e4bc356e3e965eac42505548f7affa70ee6471ab808fef. 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/ESA112303593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6449565ff98276a5bcb0f4a423e07e32f68af16fb1e5f01f4923c13b3da03653. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLZ542202322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b202a1f1ce10142eec1b19686db1bbed60b0da0908e0c0867f7f8972f46b5f. 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/NLM5S2000854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f453c603f76e5243d0cdd072a7ae839d35bedefa636ebb75a7013a9b60a7cf. 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/NLM5S2000855.