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 0x225859bbce5c9429944d2fd45037120d0c008b6d3aaadd9ddc3548d5b2e04c73. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e92e2eca-c296-4209-b807-eba4f21e3210.json and https://artists.proofprofile.net/proofs/artist/e92e2eca-c296-4209-b807-eba4f21e3210.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x5e310217c434cf8debe417b98f7b44dfcc39fa84710df332379e6a33e88bb7e4. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USWD12328205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9884411956704f5ab05eb52fa3acf5609d897d43302b7de15ac886e7583630a. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/USWD12328206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267f2a9596ead4e1a2ff5464ed7277ee9d27fe4bbe1c85e43045997efab785c4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USWD12328207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8360cd950301e6c701a982c355222259cab43ef8333e1face52f0e3b689d1e84. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USWD12328208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8378c9e0419a53a0d2ec990c2b0c7f6dab26a80ab398918abc0ef1a79151fa4b. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USWD12328209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4c89beaf92a9a3495774182a7d44df60cf044427addbf61ad027f08fcd33a4. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USWD12328210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5b39c07ab8769cc9dba68c0335f0ad136ddfe7721d9d617454d26825f2f01d. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/USWD12328211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25e4f2aa75bb891fe7a04dd4903eb49af8d37ffa79cfdf0ff6aa57bbc81f067. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USWD12328212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf70b25da2ef476b147563acda394dbb06995159a6df14ea600a39fb46a55da. 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/USWD12328213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa781bc8e8ed82aa1adc37770b1ccb955efa2b0b01eefaadcc674887d7db9aa. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USWD12328214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4d38e318560b053be8b30c59672a3686f581b1adc833125e8ccb182fc0fbe5. 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/USWD12328215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c30857322985d85525e7d3c17395ec2c75a4bde75698cd5fac55316cda4d4e2. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USWD12328216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2fda6fac11758958fdf89873d17253d67b05db6917bec868f53ef4caa4b70e. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USWD12328217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c3a60a8188b8e98e204f7ab24b73370b50af1d8467c7f8d5c3607ef99ef52bf. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USWD12328219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f954013a104ac13f4a7118cdb78098f334619fa327e4d5e6c8b9f40c33727e. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USWD12328221.