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 0x06936158db2068318d1999b7862a5021c764135af945bbcc78843712bc648fe5. 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/3314a27e-93cf-497c-aeb0-87c285e4aa30.json and https://artists.proofprofile.net/proofs/artist/3314a27e-93cf-497c-aeb0-87c285e4aa30.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 0x8f87bd2a2ffc37a5cae4d5f85bddc210d2428ca37dd7af22e4bf1b78950c4f5b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FR6F31924780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304305a310f409b595dd661f14e12b478e76ce17f25737fafe5e54994ae8cafe. 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/NLF711907891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb91aaea6611843ab46b8405fb194ad4e3bab8f119e6a1eef78d69f1408c97b11. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR6F31924720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6331f456923006023078e202d87f2796621e34a6ff18baff51472f6ddee81c4. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DEP961900050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec58b71fa214c33e4c139108c9f0aa58181e34aacc7a55a4902f9c02ca7a6918. 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/US83Z1926081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751fa6f2acac11616acffccda43783f513ad3f6765d8c35ab20fd3fd56949123. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:06:10Z), 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/FR6F31924790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854b10340f4f1bbc8cf9f87dfefd21a51cb17bf25a8cb3a85abd3cacbc6889a3. 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/GBSMU7065889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4978af8d5b9d2fe7a280f9c67a29f5c82f0e3392483d9190114bd76cdca5f56d. 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/FR6F31924810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0e8cc66836be716907398e0f2744a154959d4247de4d1cdda292b4716494d3. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FR6F31924750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe002310b29e91079b88693dedaff4c6d3558734404c079f58a8cf763c3335a. 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/FR6F31924760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d1fd154cab4478896a63b8f98cf046bf049dfd38b66fd99b7e05eae0e64243. 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/GBSCL1989066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf3676d39162eeb7285cbcfd22827538b5ecfc1234c2fea2c831ab2c23b75e9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-21T17:16:55Z), 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/ITH641924890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd337c75bf57a0e093afcece5f705b8b805093a1372f9f06a5d5a2f76b8b67b. 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/FR6F31924840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab705e608e531ef5eb14200f24dd15df75f63d8d82a55bdaf7d193f73b811c4. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:43:53Z), 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/FR59R1983782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303e5cb66c064e6fa67bb7a0183c09a0b5da3ba14db334b17590991b07a397bf. 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/DEH741913822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fd196fe73a9cd6674418a11f2447abcc8535b3203b83d75b8066c2695b9276. 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/DEHM81800370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407a1e3950f68795fa68d4702a3bbe738ad8054f88388791b85d96a82405d8e4. 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/DEHM81800347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a16f7b59447d17c5fdd0814ee7ff6b9368e28a412b058583724be9add9d593. 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/DEHM81800372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4039dd98e30a9b9e5933a0eae7162d5305a715265ba4075142de8af4383aff33. 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/DEHM81800373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739659aad3f26b92acb0f4cfb8aff9edddde136ecdefbc1caf6cf76dfda9cd74. 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/DEHM81800345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28c7e52320427a04e12e9079dacff26cae36a9893d5ff4ab02bdc7757f736cd. 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/DEHM81800344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc716f77c35f0d5d175880db62580e8e85a636ee24793c228b16ef4ff9dd8c09. 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/DEHM81800180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c2876e38b1b9e46329bbdde000ab884fcec244c2888f7c390ec1f577ea9845. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEHM81800184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103d82832f73a08f5cc456d7e911cc9beacdc50df95c2a266587372263fbe6cf. 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/DEHM81800181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0bbb6f6cbc84627450e18a6dfec0058c3256c8ea2400c20019ebc8736a5ea2. 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/DEPQ61500410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d6fceeaae5478b6fd70ebaa51bdc9978c1ff57b3ad3df513d18a272b0d69a2. 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/DEPQ61500411.