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 0x4789e7db36650f3f4982ab67cc20fafebf4ee67e1d2221598f689e7cbaf811b3. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d326a6bf-8150-47e0-9fb9-651fedb0da5e.json and https://artists.proofprofile.net/proofs/artist/d326a6bf-8150-47e0-9fb9-651fedb0da5e.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 0xe3071590a46e74be742bffaec5fb5f590c32c7cc73f27303a56b422946d75958. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USQY51444731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca64be7d7feed00935f3651ca84baf0b808d32cfc485a79e6dfd0eaa94e816e5. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/USQY51444732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6576742b861fabd77e76d3e5a903e2f2a96fff617a3a421bc753e13b15abc380. 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/USQY51444733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128e20e93dbfa86dcf2397b4f94dfb2abacab184ca7acc3ad71419acef36ce40. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/USQY51444734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374235df8d5cc0ec06e31fd6d29002d3eaff4c261724e1f6a8973b41755d4c5a. 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/USQY51444735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c7df6179672bf55faab391cc808889556682eb5894aa05497f3b948d62d50e. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/USQY51444736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66cc342f8025846a28da2f71d455f8c088ff838be92c6a5ace81b9732bb7e60. 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/USQY51444737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb3d72aa177935cff0a7b945ae0d6b06fb0f19833126b7d6b64adc0a7f50bd35. 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/USQY51444738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9684df0f607c5b9fd737b3282609729f29e579328a9179d5ace6418247a1a11. 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/USQY51444741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a68582fbc5a84e1eb59efe0d6bde2fe96dc47bf49330bd36b73870a74f9e022. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USQY51444719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a611cb13b9c73050c7b4194d3cffa06b4df7ba0d6633b84dcda012a3d79ca2. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USQY51444720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82a289b562dfbeef3b3d701d8c29f966fce268125cf88c98f03f23d542d0e614. 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/USQY51444721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23821506b46dafe66c424125831ec90e31c46bbcf3848ded6deba2d6a9eda0c. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USQY51444722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e62158b1320ab483eaad6f2e81ad9fd0dc444b61854b5d92e9c6b451278f99. 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/USQY51444723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ec0bb9601faa113cbaf534d881ced1cf570eea17f917d6e85672b26fa4de93. 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/USQY51444724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93da62a2b751dfe83f2ee6f1337a859176af17a44f20f874cec437ef7610098f. 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/USQY51444725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46f164f58047bacd36827558104fe7e259b550fa8d6fa17d977103bdddf20e0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USQY51444726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c06ee43c402d01c2615c3e26a112e5b2a0c1b69cab3380bf7d54aa8c912cd6. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USQY51444727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c1edfedcb3b8138d3c4cd90224fa4feb0c21c942f5cffd952bbc5a69572b50. 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/USQY51444728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7e43b1a295a6516742582afa05f7326fcffa6866206dcf07966baf41dce1e3. 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/USQY51444729.