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 0x7607c7a6a45489b9a5ce96e76bb1ddfb417bba204ac37cfcbc0b743570fe311f. 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/a884872d-cc52-47b0-b812-ecbe4b1eee4c.json and https://artists.proofprofile.net/proofs/artist/a884872d-cc52-47b0-b812-ecbe4b1eee4c.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 0xd59b24ab2d1edb6fe81509e50c0192d47facaa528178d5782f638e69e849515f. 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/TCAFA2042672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f89bb9661c92998bef1a927b1f6f4fa63a66c1de828227b012d1f352ec7a56e. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/TCAFA2042673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17586284368f90941beb74e8d59200f79ebc72cec0209a0b80cede4a4b8caaf2. 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/TCAGP2258740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f5796d696c965001b6b8cc330a89a2ffd3544181727a942dc05787386cf3ee. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/TCAGP2258748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ade046679e5293c13ecd9b8a9aa8431951f63aaae190164f4f9e06b9a51d8b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCAGP2258752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd654626d30f7f258e9a4a1bb72320db0416371806ddd240481e6fa80a919fae0. 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/FR5R00904351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8547c76e42ded4a8ff38f33a8e9d6964cfce77104fdabf26e21d8b984648c45e. 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/TCAIF2437083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f829fc5f7ec51ebcf77ee28c36d2865881716470cd4377ec1c01188b3da17c. 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/TCAIF2437116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85884675386992416fb9fd7079edc0c394da21c8d4b5b964a19fb158167dd61. 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/TCAIF2437123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284d32b8e364cca3e16984e20b4f03de8ed78d8f05066ef5fc119b500ac5931f. 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/TCAFA2042955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab5d0bd4d6fa545d86df0a1be523c8100fc7db186f43da16a1c0efc918ecab3. 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/TCAFA2042959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3df7af8dedb2f9af49a7b430aafa69a477e182a9fbe1d0271ee63bc6ee3b52. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCAFA2042991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577f74910b02b8be0e12d212e2b69ba08d6ade4fc62e4b5229f8d38084100a2c. 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/TCAFA2042994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50f4e25458dee897731d0ceaa7ca121c78ea3efc2e52c5c963eed67f3b8fcb2. 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/TCAFA2042809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72828fce7e072b98922c83191e59c1dcf1655d08d82fde48d8280691aa49b429. 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/TCAFA2042814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6c586f52f269863a45d18fb76b785dd894de670f0db6cae9d51c34a75913f2. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/TCAFA2042831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa019353f432fb7b5abc49d3173586d6e8fc3b753761666f61badee62f1633fc7. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/TCAFA2042859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fc9186ed95be81765c6decdc5ec5fb662673eb26870b59c736a0734f7cfa8d. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/USJ3V1835821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11be182d47706b7e5b9f1b5c92f90a9981e2543b439a63637c414ce885c8f9a5. 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/GBLJF0504603.