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 0x87f57c7a8057a1407964b36657bdec16f669cb7ee26162be4cbf4fb4a91b9d34. 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/86a52ed2-e39d-40b9-b934-cd688c02dcbf.json and https://artists.proofprofile.net/proofs/artist/86a52ed2-e39d-40b9-b934-cd688c02dcbf.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 0x36daa2c1c7008c33b9e26b1c313737eeb610f024f32983907011d11938f96b6c. 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/GX8KD2202116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b74684066c27fc9b5bd7412c901fbf67aa14bbd7d9389f39a6aa6fb2c0ef5e. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/GX8KD2202118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7dce68e07edc2d52352dfe615dd08082d41febffbbea222d9d00d657f27fdc6. 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/GX8KD2202119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34bc1469b14a2231439243ff3b84cce9911553b24bb1d3859ec7091858da5c46. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/GX8KD2202124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f0eaa82b2da1301d94c57e241561a93ec3f03856fcbf5dfda357fa7f857004. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/GX8KD2202125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a01db30b425cc76ffb3a2caab190fa2254119c7371365d91a705bf488714b24. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GX8KD2202127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b3014aba2f1d755acbe6dd1b008943b4bfbb339eb2a02c4369bf207e90e98a. 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/GX8LD2350230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48f883a2c71aed89f24f6f9a5dc13f928e6d8aed0f37de6a54ca3e853d4a005. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/GX8LD2394867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2885f4180f2a8024e4a2940a3888a22a26f5fdf0b598d32f4044f939a62b02f. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/GX8LD2306793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37318177eaf8c7df99c5b8712056260eb1edb5e2262d3760c7f95ef87d55ddd. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/GX8LD2388420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ee8cc21dbd516c36de77359f6347d681507f3f81c1a2c245482ab89093f392. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/GX8LE2499653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6764642c13f4bc1807407cbf263b95f9fe857f115abcff6b73a8e46d7f8b96. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QM7282593158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc335b6c4e0fe4b405fa0cc8071679d81b8680ba5503461aafc7525b405d34976. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QM7282593264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd551a2c8298332aa8b34070ab52d21a858bd314115189e1e3e25f12951f324f. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QMDA72510109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc7f65c9745ae9a9c033ea59a72e2e1ce6b2d49a5bf8cf8cc739e6e44840451. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QMFME2535265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf421ffc939e7955e36618ba51889f1de32219f7bea6fd4197aad432060744a94. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QMFME2596265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3202560ac3cd0006e38a8a806520e26e114d597c561e0ec23accabf5198d19. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QMFMF2561775.