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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406ea4cd5934e132ddbcebd898f598731e5c49dd986f1cb265ce5c07a2beb1cb. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1a6e9b0-ef85-4c7c-b11d-9523f3f1b284.json and https://artists.proofprofile.net/proofs/artist/b1a6e9b0-ef85-4c7c-b11d-9523f3f1b284.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5fcfb40f655f8a30a26bfd129fa60ca32e2407f20790cfc676b07048db77ff5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLD231100336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1634eda5ac5da008ba7c6f06371a523bd70f82cef350e34a9337b727d6e62e4. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/NLD231100340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4eb086b6b7ef58330f0f013e3bcd5fde15695f7f66fc1be849cf5b8238b384. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:07:48Z), 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/NL1VU2201421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c7578c7711b6d577b3a1b77f425bcfb6d88637bcd79c846c7744b016366727. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/NL1VU2201422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97121eb9eaf1eac2a17e34569adb8fe97e3762a948ad06e3b49049677de86d3c. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/NL1VU2201432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84cf7411d042192f325baa5baf82a4cd5c000f3bde3399bb4fbece7bb8ed9824. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/NL1VU2201430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f2686d71579c67cc59ea1f9dc4e8ec558369f4a4c6b4cb8d1e237a0b492fee. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/NL1VU2201427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9793e8a834c67a6a3ae6570f0a4e39b6ebe1b8739309a30047b0c573815178fd. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NL1VU2201435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf265517ef3ca68d6024dd53dda120189754bc25e651a17bf6146a429026b75cf. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NL1VU2201439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf684f79870d8f4a0b6962d129864d9bd32fb9b6915d2be580bcc5222b2c5a8. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/NL1VU2201935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa02cd1c71192620ac92566760f5fec4bcf81c6c3e47e3f778fadc3c34034b8a6. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/NL1VU2201937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc3cac5836019141409497552956281108e15ce3b67182b6e190503a1e3a369. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/NL1VU2201941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d247dde5671d366c6842627e8d37b75fcfae117ed59f6e9f5274237f0e4c11e. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/NL1VU2201942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ede55a1dd600468f89d1ae9754d5b56abdbdc9a27495e76ba79a0def7c1d4cc. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T18:00:59Z), 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/NL1VU2201944.