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 0x2c281b125b3aa72fd60de5b6019f65253334f57f844a14ac130994b0e3932a86. Chain 2 (Bitcoin): anchored in block 953695 (2026-06-14T21:42:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/71e8e1d3-34ac-4e73-9245-fb33f0b1f52d.json and https://artists.proofprofile.net/proofs/artist/71e8e1d3-34ac-4e73-9245-fb33f0b1f52d.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 0x323b195d2ac22abf3eaf62de21603ae3f95fa157295b0896453f365c859f0589. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCJPT2275183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd48ec8fb2e0bbbb34179bf18183e47dfcc17ecd487fd16e3bb0386f3be4b22. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/TCJPT2275190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed9beb12fa9960aee8e52eb64267e670969d945a874f895ed577afd48f3d4c6. 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/TCJPW2350164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1de69ecf3194f6b2675ec7c0f75f9733b8ad7b4a3e74ee17ae9f34c3e76db1e. 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/TCJPY2312155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a5db18005d2879b14e25c48bff93111faafa24826233789de169f350e3703d. 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/TCJPY2312398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a8bba78a9ce2d20596b995ea40690eec1884d048bb21e3f9800a0240f8871f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCJPY2312411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59eae2e8e80223839e25ccca2bc79736f67b62048abfc9dab412f47b46abd02. 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/TCJPD2408076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfef8f31c5b0aaa5228e86c3afae57c721f5dabfc43bab3a8540c1e6fbcefa744. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/TCJPG2598475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff0a12144f87c9d4e786e25b96bade24a748350b06fd0dc798d2db238540b85f. 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/TCJPG2598486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107da0789be2aaa04b495977c1bbea9bd4e7a271cbd89d0d46837798b12a0674. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCJPG2598505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8089ac95365836b1b34452597041fa2223ece4b378213cc8e206719a60cf2d2a. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/TCJPG2598526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5fcba2a574c2b98005610323e5b427ab0af9e6aebc7c9caad9bd97597834ec. 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/TCJPG2598529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f03655aab17794bd61f8ce20e3b3953ffd571aad925772f15468c75d94feb0. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/TCJPG2598535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd441488ae68126d4ebf38b64787b901e934a63cbfbd34efa7bc8eb60fa7d13fb. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCJPG2598562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c2803822ae42ee27ccc99537edc8ffe2155816a41dad059483773ca77e0ba4. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/TCJPG2598623.