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 0x7aa16d79672e3535e3a1aa9ab843d172748c501a864b0edf17026fa3736347b7. 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/f0df6876-3882-48cf-b385-9c846eb17415.json and https://artists.proofprofile.net/proofs/artist/f0df6876-3882-48cf-b385-9c846eb17415.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 0x4ebfb56c7ba6e1fc5c57e83a06471f290c81b22c974d80b76afb3f007d431cf5. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZZ7S2450608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a26d0449b3e466ee3e7ff5535647a6a53d716a01b0d7706e8c48771c319d83. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZMEV2138874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8463587457afb0d412ad6756f8ae10c495ba47821005272896a5ec52f603cd04. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTAW2210172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e358788f3c68c5bfee8c0a6b791a1fc24e61d0bc6d454e8424f7265fc3f5180. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZTAW2210173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273e079d67c802623188934eea36de97062104e78b3d216a7918725b2928a171. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTAX2286533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80a0f8b80e1f658e3fdb47732b6900371a3b8e9d091e6c0fb6808989fbfc852. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZZ7T2402723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7993f14e2f38232d2ffdaaad52e8094796f957e2a7d11098f688998e22a7c04a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZFZ22345078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe409abefda68a2136a8eb6177da0cc53d34b42e556cdfd2ddcaed5711e1df05a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZZ7S2450597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da857be471e87c1669a81dd40138669c95c9ebca24fbaf6a42b34ce4fb8103e. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHNB2481924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61364b73684dda637dc8243f1229fc1bde1d8d8eafdea2168571b2a80a642898. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHNB2479453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08158feccfdbea1445972a600f92b9d8eacf8ccdbd64070f02d9ccadff38132. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZA742423463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b2bfb5066ad63031240373a4bbe89e20d5476679163424fe11dd2928fae264. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/AEA0Q2474306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7009f059046e40bbd010705c328f3c4888129f285e37e8c80930b31da9d3a56f. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QT4K52581242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b2d5253a9b8e2711444c7824d1c1ad322d0b79a57cd314dfffeed06deb309d. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZTGW2402723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84198bd82fdf0a0b0f37d8959bba14eedd35532479b42c1fecfe2c352c1a248. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZK6H2591269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4396670572a190b153ba91b942dd699f76c066680624e28ab7f8c9f9db0a55. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBMA22599974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805b1dbb68706a4d8be151f003cb501af85bd7776db6485f8ab93ea50f45c520. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZA742525448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf627555da6d6d81c371983299b9f47fee9d7fbe02fde8e62e6174c352b57dace. 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/QZS7J2578208.