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 0xa834388bdeb5871a3f3af2a215b11f1ad02099be0ede288e7dee9ac30c672273. 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/ee7254ff-54eb-455c-b713-53ebfb1eb946.json and https://artists.proofprofile.net/proofs/artist/ee7254ff-54eb-455c-b713-53ebfb1eb946.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 0x6d3416d9ec924c89bae31fe6a8c946237e67b883972aca621411cfd7d7bf9dbf. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZPLR2033526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5556f05da5e3de3539aa6fdde49d0b88c0ebf4c777128f1393023dd311201be5. 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/ES47E2004779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6e13061031170d536b8e56a393ed306d0c553a430429c8d0f621f1a4d50008. 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/ES47E2006373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35dd8a0ba0972fc310057445dde294f87667d064ec94ccb6e2dbfd538ff6485. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/ES75E2203913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd109b3cecb05b8c9daa366e22b6b3e015ee2d72d3ad0f6b2cab3be4c802c2cf2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ES75E2204815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa465b312e25279aa78d4a1b1a530b5bc7d6c5fccdb730cf57e6db3521c04a82. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2246841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70594a08da20cfd95964518f4f20ccb031c843b1af782e2bee195a85ac3015c7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES71G2337527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8b05d49883bc40c358c269cdc615a5de8e15da449cf21c62c6956c540c02d6. 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/ES71G2409111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ddf117b0a87adf4f922e9a73fa489d6e68747543ef245ae5dc00826883c87e. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/ES71G2414751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34abb2c031c10e425a4e20e16d9d1b6ec28d15052ae437efb65e6a7d59f4d9ec. 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/ES71G2433239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dde6ec9461956f6dc3f408050b9c07740c73f61bd04f5b466928aac97abc563. 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/ES71G2433243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be902e0a962010fbd4a77c48a198cdde6774a4f3e9471ec20fe793266e15b45. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/ES71G2404524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ec9dd7bf3021a507d3f27f88ef434f63b3223cea2a218d52ed5f4a269ab7b8. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/ES71G2433245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ddf117b0a87adf4f922e9a73fa489d6e68747543ef245ae5dc00826883c87e. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ES71G2414751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa906971662790408d862f0129fd5d5ace83c0315827884fe7c1903004538cad4. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/ES71G2433247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf81d563c9c05e445f9e4309dabefa660c0d58f80a2214e58ca28f15ef02ebba. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/ES71G2433249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c0526a6db6c95de511d6bdea4439d787ea0b4ca530fb1a578baceff519bf6bd. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BK4DA2401589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e49fbd7b06f26c3e8537afd54dd0bd3cac40509d62c7bd9c7fa02b2e56931d6. 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/SE6QE2357611.