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 0x0ddf455806d12c59a50ec4433a57140d5a84b48f541e4142061b892c7ded87f5. 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/ecfe7e11-4e90-41ef-8123-ec9d88549bb0.json and https://artists.proofprofile.net/proofs/artist/ecfe7e11-4e90-41ef-8123-ec9d88549bb0.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 0x6ac8cde982ec3e1aa5997a64e0f6f3c5c59b22a3f4afcba02d43c3c67037590f. 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/QM3DF2200382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3bcbd6d68d57043b80b895e2aaf967170373d6dcb28df1ae3e3cca3162df404. 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/QM3DF2200383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095aa4220e8a4ee68182880c3e2b601c1af343ae1074155e112893191ed9d82e. 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/QM3DF2200385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485f4116dabc9a94258d59b332008528ee622db1b22512d51b0cf826fc5da4b9. 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/QM3DF2200386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0f4de49e40534a3f98895a6aff2371c524f4df496804f2b9e9b48ef6faec6e. 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/QM3DF2200387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a361aafc884bce24a8f764466ee14e9fec922e087f4e17356462ce25a84d1b0. 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/QM3DF2200388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a3490954354241f4f1f2fe1126c0c74e78119964fdf6b10f3a04e9a683d2be. 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/QM3DF2200389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6b2d2bc4170866bfb9fbc3e689bba811ea66cc71dde568dec24193a5dd84ff. 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/QM3DF2200390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74db81f92d291a1a8b09dbb678aa60af9c2b2ba950dbca5067544a6c59bec0f. 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/QM3DF2170889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b44dced567c98f1eedb5bfd62aa3ad369e0bd23379abcd8628e4981486f1cd8. 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/USL4Q2050918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba10b3841a243ddb64ac810510dc63a52217546880b89c2ce5569079ddd44b16. 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/USANG2469617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29f621cc145ea0cc65a0bcee0d9c44b3f3516fd3fcb1f841b3c3118261075c0. 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/USANG2262213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88c7f658db1c1f51ff1194279f7fa9160d8609df380c689b887259b670a1288. 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/USANG2217345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897b4c639ec530a8ac3540b6f2d5faec2a73afd4f169abf6a23cc9f4c0802601. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USHM92036002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c9050ec611edd5b50f8eff3626e32bb69c7e689ad5bd6eb2abfd7355af234a. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/USHM92036003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc909355a1467e91c126ef820aff6748fa20f5f1494d198a905e7c9c3b50f379e. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USDY42094935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe46d786e47fbfa96c8399f995ebf2c84ee64bb87f3f121d5455c47a9ff8ab22b. 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/USDY42094936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5ca1ab468a1ae5275abb3243bf2e89111b2cee694866dc93201627ef69f184. 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/USDY42094937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e198c19b3804fca1e24a38e2d4c5af4ecc29ce2bd3441062688b19d29d79fc. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/USDY42094938.