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 0x94170cfd45cef64516601122dfe0d07c107265c9038324c03fbb02851f7bc7ff. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a9f70f4-118d-4e46-8763-58d04414d3a2.json and https://artists.proofprofile.net/proofs/artist/4a9f70f4-118d-4e46-8763-58d04414d3a2.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 0xe60c5f7c05ef9abf454080813dc5f769cf65f50c9de5cc51e3621f727852e892. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/QZGLM1949753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39bd4dbe3f4e5c8f25ae63a5f21094db232cc629eb7a11a5426ce640f02f56f1. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZHZ31975308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd772a51799ded2ed4b1f190772d4900745abfd1ee331cc9dca759e38e4dc6656. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZGLS2178113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e253bf5a8f922af2329b4f80c8767e05bdda05f13bc026dee23e8c829e4080. Chain 2 (Bitcoin): anchored in block 957730 (2026-07-12T16:41:26Z), 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/MXD782103888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3483daa9732b36eb72f4145bc3a8bc072943f8fed1439f4d8a59ffe202682f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/MXD782203764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a76cc46e665c672859af8ac268ef7624c43d3989dc5a2b47435945e480a973. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/MXD782301822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551fa9b1f5ce14f835dedb40f99b5bbdbd2f5db3405a6dd9148e7a2f93725e0b. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/MXD782301129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf150f17f64dd29d58f51c0d1718cffd7baa6f5ba9eee86fc0a626301b50f1c. 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/MXD782301826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3483daa9732b36eb72f4145bc3a8bc072943f8fed1439f4d8a59ffe202682f. 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/MXD782203764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda983b8127a38cd46596c8db97f5303b328f53d10be42bf538603edd52c52c6d. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/CATL32000814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89648850051a7331d860aa69e7c2841892cd2b0750f3990c4ef48b89283ee6fa. 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/DGA072142420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f2dee36053024399842107601d3d77da1e2a968c2aaee370c8fc3383f5244a. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/BK4DA2307416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0deaf12c4e68e0b7ec2ab1d8671b9be1f2a85ad667b14c00b94e6531ee2d32. 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/MXUM62000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d1c647c9ccbc8d2e6f9e8532950e99a42e9ce5a6284c7fd7d897784fd628d4. 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/ES71G2425012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a47bb2fef07417102d1d098aa6263d8ff7403c7d318261aaa9100d217d1448a. 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/QM4TW2478348.