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 0x5761032d26957931e2bf3efcc21b0e3f2155cf049d02c7796b02c81d27255991. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/745b8ba9-e8fa-4e67-bb65-8dae819f6ddc.json and https://artists.proofprofile.net/proofs/artist/745b8ba9-e8fa-4e67-bb65-8dae819f6ddc.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 0x5ffb90b0b23460ac00a4060bf251ac36af7d92e0cc101704e760dab343f77053. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLCK41097083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f58f62f15ac6c7dd6baf5e2a9a5ebcf4ee0d86db33853a7c44d0a188be8f6c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLCK41097084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6daa6a992f7d2785df3331d9fcb352c1d0f9db6d18d5cacb1ea015a4cbdbc8. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NLCK41097085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150397bbfa4205f115bbbde10f033339fe60d3bea8a2994b50c3622910f866ec. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/NLCK41097087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250c9aa449546d7d3ee79a6a30a704a76df8d4a5d22b7316d7d7fef07052d229. 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/NLD062400056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb574e9bc5cac7ff083270ec3557fe32051529ea5d0af1237e0298082d9ac981f. 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/NLD062400057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2170ca440716343bdfabd1366dd874887b79cd7a13037c6eb2f36a8485bd39a1. 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/NLD062400058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97805e3e0e01ccfd10bde3f3d82c2670c51dac0d3339eab27d0f59ba4089c089. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/NLD062400059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fcfc209d75a2e84879c9c9c692984e421fc34680f0fb09711655ee6a57ff79b. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZMHM2278107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0da2ed14fbd8f83ae3a69d44f40208765cc953ce5ef2daefdd3c7b907ff5c8b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZS662214195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68dba6a470cfb965e339f3ba539010cfe31fec26bc72acdeabadf2c7da21a1de. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZS652231419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b9f19bde88109d2121a0406a6cdd8ea15b6daaf0fc61703c1cd3c90d6ce100. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NLCK41053507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe250cdc578db8fb93d887ade6805711c50f703255d6b128ab637e802140c32bf. 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/NLCK41053508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c92d6778bf2228fea3559cfdab03ab02c20d051a695c15d2b7ddbfa361e679. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLCK41053509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697ac882a7278d83e8e91c65d0d4d7ea58a115f60b79cf1a1df7a0f2054f3073. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLCK41082422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b1d184a94cc18c5850cfac625974dd177f05067d62a217875849c09b21d20e. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/NLCK41082423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df727e888fa55720107669c9b88e018b7205b1bca0eeaa68916385ade1bf8ad. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLCK41082424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4062ba0b6d3cfe7f5f458e98701212fdf43924ada8fa8e5520cbe9f101c486e8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLCK41082425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2a768f7de96593075739bbcb530d18ce5df07da9ea6f7edb3d3f1acbaac87e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLZ8C2400290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed1174190702c261d89c94e096be62efd362168e8ba447a22b503a178e1ae369. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/NLZ8C2400291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d36cb05c4323f23d855ff965968ae77c596b73c77705e109dde565b5831d62a. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NLZ8C2400293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea223b41ea6ad2978d5f1c36b886dbf1788077bcb99f6ac7dc82ba53dcada66d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CA5KR2147645.