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 0xcd945b7c16f993fa4ebf93b0378002281139ca93a7947ffc696a0b063492231d. 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/f616f863-6ce0-4811-9bd2-d40264d05f7d.json and https://artists.proofprofile.net/proofs/artist/f616f863-6ce0-4811-9bd2-d40264d05f7d.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 0x026340ee12d9ccee50fc920d46690ad63573bcd6638a755387943c006d4109cd. 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/TCACQ1629651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61571d1a7fc78c7cb8189f9b39c315e1a930048f316861fa9ac5bbcae0842a04. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/UKJWJ2200280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ae860fd59a3d101c3c671715a6bbc51e1aaa9e6891f7e854291616c840f10f. 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/TCAIS2497303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6b67032ae5c941f6df605f3b67bd17909812c1ba52386e7cd127ad31cb3648. 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/TCAIS2496853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49597971a7792b5fcf93d464e3c5fabd3c6da2f45e9aed30d66f1a7e26db5bc. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/TCAJD2400801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32753a50eac303cd85308749b4d0afc4f464081261a745e47704da418fce963d. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/TCAJC2400813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b9672642fb41055eb6bf1b90929b6ae2f8355ec190d0e989fb19ca6b56914f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAJC2400852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630075dc8ad8e3dfe5f89b7b168c4169e2aad2c38cf6a1d6eaa28ae369aca04a. 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/AUNV02500026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb51e430e4d4f263f1038d96567c05c80231731f23711a63674bdca00badd218. 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/AUNV02500043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69987c806fbb1daa48a5e0ffa847f1578f75bc8f1f0b098f4c0824444570558. 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/AUNV02500045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21cf3e4d782247280d91fdf45e9f5bfbf714b97a89da3544ab10f28dff93f88. 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/AUNV02500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc77421b88875d50927b21b290f08331615bcc7471fbe1abcc8fa4a62e16cf94. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/GBTMZ2001036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d3676f455d1ada7b353c0e231a266d7fcdd5998d1e6966ef26f0228152e4b7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GB5KW1803487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719e701f9ebc5799b682777a4e145f51869616298be6283c1b8cb6a2c16ee57e. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GBRD52000416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5f9d2995d35af8637ae5dac715c3551e32e1e35750cc99b702ad7e7dbcb3c2. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBKQU2380465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2954253a346f0989b8c1d47abe58eeedff2f9f429d9e8c36bf05672080c94f09. 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/NZRI12403471.