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 0x9da22976b2a6bd96a92e1cacd07c0fc332c4924b42890a215b1b76653eb99020. 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/aa8a4721-73bb-47bd-8d33-5282aa35de9a.json and https://artists.proofprofile.net/proofs/artist/aa8a4721-73bb-47bd-8d33-5282aa35de9a.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 0x914a66f76165b39bc02a454a9785eba73699ae19e45b452d0044694c2bb25c7d. 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/QZXLZ2512950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf652ade8b5c2728dfe6ded3c423dc37a99bfd209e8a6762edc53f14036fb2f13. 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/MX4971401482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3cbaaad860968fab7d70cca98fc28852980afd98b8e22b232e22ccb73466b19. 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/MX4971401487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8ac6118e690186b2d134b951b48467755a8784d5e9e04e0c0c2963f6cd2dde. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/MX4971402388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf996c40049e576dc95d1ad6c5054f1caa9d505181d7cade2c50c086875387a16. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/MX4971402392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88a8f31ae1093bb0fda07842311628079e19fe71b4eb71fcf75b00af28cdffe. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZXLZ2512930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4bfde01692ce2aed591ee251bd8089d08534bf4c980b8b23e56b7595d8a86db. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/QM6DC1511455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f53ad4fd60dec9fbde0e7ad3751cb9d969c8261dd14ed3778d38e65f5840c38. 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/QM6DC1511459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fe133173ee987138bb5fd9d261c46964a42f0de5e9670ff67fde0c8d8c2407. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QM6DC1511460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21639c3cad926b8992ada0aebb169c84344411571deab45d6524eae9aaa0d62d. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QM6DC1511463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x347d6fac9c7e3bdacff62ff84a46a255a134ded703a26411e780aac2197f0627. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QM6DC1719694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ae3ff81c3e8854de9d514cea674e91e727b9f85f97824ba59d3e6b3891e1df. 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/QM6DC1719699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f95f98d9d2b395b987e018369ccabdaa7bcdc29ead7a13f4f35febae7ec028f. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QM6DC1719701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769f6eb1bab53154f70e5a5bc9b12381930b93ec3668c6ee3759499ec39bd82f. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QM6DC1719706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f95f98d9d2b395b987e018369ccabdaa7bcdc29ead7a13f4f35febae7ec028f. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM6DC1719701.