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 0x3a8eaa20f0352794891b90f2ad5dbc1847bf4bd4913db87be64f7f8e1f301f02. 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/ff872eef-dd3e-4992-831e-729b12e52293.json and https://artists.proofprofile.net/proofs/artist/ff872eef-dd3e-4992-831e-729b12e52293.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 0x030c18685b5e0db7acc5a1e28424280efcb05cce756c536a8f2a785c97b7897e. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/GBCHC9903421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba11aa7ed59217586254dc210a925969f46ffd949e7795c74bfc5924ba1ff4f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GBCHC9903444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e88a7f1b2992c9f09a498fee21e5378ed1fdf1f9b813f863667684770cf4a5. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/GBCHC0014921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3398ba057229099a163a0f3b6088006203961d0a3875cc739ab489e7d6a937. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GBCHC0305830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b76dec77384d2306ee2367983656a3cd71aa1a9866fe012728173ae3b35fd03. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/GBCHC0407150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ff5819207fc0a380ab4e97e7dcd604aae8b73a7170de5eb397b621dcb4c04a. 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/GBCHC0306276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddbfc78fce009675c01c3e42c6f724fe99aa443f6d78cb79cb275345d88914ef. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBCHC0607761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478c9de90eb67bbd5e437cbf0471d5558df5b9674c87de6c99413ed37fef7508. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/GBCHC0607763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652d5fdd91585cf179ce3a21eac015e70a8c12ee7abee491e860a9cc782b9d83. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/GBCHC0306252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f356819301fe6098532da6f04e022f774b2da0251ae55d73abf8a0e5649465. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GBCHC0607768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd30e0d4a1b6ebf0e09fe3d608fc9c43abb4b2ace6861e862ec6434bc35f8ab2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBCHC0607769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965ac4509b785bf2852a4392bd1656fb01507613d4bebb851183bba05e476e73. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBCHC0607771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fbda66a5b72632becde0bbb6673d46fc1052915031e16f53a0e8b0f53e4c3b. 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/GBCHC0607777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea1cb6cee2cb00c1b9dc34683c230291b556f90bf7ba5f013321229c2659bbf. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/GBCHC1009463.