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 0x5148ab940f6c46732e15cf704c8e68f6fdab096d190622c9a8cc9898d9f7cbae. 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/e2cf9608-04fc-4d52-a426-9fbef291af34.json and https://artists.proofprofile.net/proofs/artist/e2cf9608-04fc-4d52-a426-9fbef291af34.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 0x495a207bbd6746ec41dc628c010d9fa3cb68cc75ee3a8912c5466b87cbdfb434. 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/BCUTV2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04e23294f5defb325687c9b295cfaafcd29452d26a35d3bc0799f5fa96240cc. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BCUTV2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a73adab540864dc0a560dabfcf3659eae0b1d9b326aff9a92de1ad7abd67dd. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BCUTV2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0a323ef3308119f9747cba1692d4ab37c52e153791abafe6504568da8fccaf. 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/QZ5AB2126936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc7d3d0c5d24cd23b92a57703680e2f76ed51f5b980dc3753bab801688761cc6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNJV2048962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c80c9491356ab5b4778c5f4f1dbbdd8a1364a5b913abb91ecf974e9454b6a35. 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/QZNJV2032882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357c944be33af6cc18eb1cbcf928ff896e53fdae581e4d7cdb17f94135435b53. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/QZHZ62066008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5239961251261f5e0ccaedf4e092554dd53631de236ed58ac125696256da6e74. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZHZ42024998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57091e46b453957417836b4e4e524b4b77aa66dd966dc94be0e57fe28a1e97ee. 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/QZHZ32043863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2b3daa285f6351a813ecade4326bc7a49d3721172d3b3ecb5cd4b5248429bf. 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/QZGLM2092101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21607dfa3401ee12f75366ae0da981c7cef7df82627e192da19a9ad1d60e6ef. 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/QZHZ51908968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea118247725c7d6211cbc95d91b0de559a73e3515d944e8f466d022fbf188ad. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZHZ51908970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcffeee0d8dba77fd4ed2b12c2e79defdd734a5a9f63fdc43c7691827fc95298e. 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/QZHZ51908973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe5108729ec434668d4f95857544d0ec18fe7245169c867968eceb8ff7494f0. 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/QZGLS1909361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fc3669ce79ab536060f9b379e007161fd6788ff04b1ab466f4acf15b64240c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZGLS1901781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f96371b97115e931764b766ecd4f2a2b1e9e20a1d0f97e8b3ae944c36a0ab8. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US7VG1816318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5eb7c49c261d51fd82353c2a4bedc11f5d1391c592d4cb556d3e13a00129a55. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZ5AB2076802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c5e816ef09317e79e2ef0a35ae5b716ab32d2a49c86b2679057ad9ceb42001. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZ5AB1878205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e52c9e48b48f35fa356179dd1f90eda53329b1aaa2b1fb23e3ca0ad56272eac. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZ5AB1848232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b4ed875d60d2f28d67ce1e951ba99f4a2254fa463827c5e380766864ba84fd. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZ5AB2050190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316cafb18fa00e65451e7d1c47ee699069fac9ec3caa9ef8713970eb18e7ea69. 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/QZ5AB1896708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b6ae0f3ba6f5c686a23853a69a5a47f94f2ecece9696e8a474a955ed872831. 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/US7VG1841002.