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 0x6ad070029cfd88704125d46bc776761e81e819f7da454de97893a2cdca47d357. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eaebe5c9-9624-4511-b803-8942b9abc071.json and https://artists.proofprofile.net/proofs/artist/eaebe5c9-9624-4511-b803-8942b9abc071.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 0x98bb9cf55227ecb8fd8f7d2a85595d8dfabe831f7945cd7cd6a92b9b1b79df3c. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/TCAIT2496093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6640e476a0bd1020fe97e4ec447a59fa2ccccbc5ec085e56a0ebca63f6d289c. 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/QM42K2480796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445b1a70f25757b058b2de94e91d2404b9f5c34949a1784f69eb2fbf0d563b39. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZS642589298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d6329a9b8b59f70020a8c58d4614dc0ef609908a80f55e72133d72be23dd02. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZMHM2514990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2056e51f1586b70030c166181d11853089c7c45b592982259e5e619cff0c5c8e. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QM42K2573106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ae5f299e50c7bf8c1e06e38059b2f78a95e786c7e4a2a3eb2fef0407e91f4e. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QM42K2538429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273c895551ae54a718ec1b19fbe9255743fb471bd27b5f5688119ff5b3de154f. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZS632569073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e71975c8d8087023fa44ab3b5439c51215a390efbe446a895a38010cf48daee. 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/QZMHP2531664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a61c8ab396581452e5bfcafe3ab2036e27da49fc47af28c23f0577f4ee86ac. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZMHM2570471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13093c1c36a69359faf0f64a855962779013f051934a303d83cf6f3a7463c832. 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/QZMHP2592448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892a93ce98767c57d491eeb207a98be9f4e3b0b96fa6a8df5cdb8e68e3a775b6. 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/QZMHL2576733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae1f4d8d01e8d2f80ae13dd2268acb50af01d21a4c3ed39cb3876c161baa108. 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/QZMHP2461547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697138d866e7d2b309c42e4728d99bf44c4c597da9588f2e6600ea36c0e125a2. 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/QZMHL2418306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc9548a2436fe6b5f6ebdcb5102af62686580ecebf17221765e2cc1332fceea. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZMHL2422699.