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 0x641904589c20def92e62c0e1ed082e14aba03a505d781b6167929c9c94260351. 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/8bccc012-9388-4197-930f-45a5e8e9ecfd.json and https://artists.proofprofile.net/proofs/artist/8bccc012-9388-4197-930f-45a5e8e9ecfd.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 0xc9e51c31f3f501cf2c43ba34e5cf8880c7eb9f997aafcb8fbfa583f27ad0c05d. 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/NLT2H2300960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e87b856f160ea2a3e0a408cad7a6f8b888b443702778766a913f57d51cdca9. 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/NLT2H2301206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf3891ccd99cbb95caf004840ec6c726485b66cf0f4f3214f417ec9f425752b. 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/NLT2H2300563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef66056eb3bcd655699bdba52179bf2323f3a5ffa084d0e45e09e52befd5b55. 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/NLT2H2300279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27605ca4fbbcb51229be51b45d2cfa1818225c54fdeccdbe7590259bce613cb. 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/NLT2H2200681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29b14914c6f3017c97d4880c9fe7a491b67112b42a9771e624d84df47137456. 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/NLT2H2200854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9458856ef42111974b15b38414dd5c436ab22b2df457564553a938107c89bf. 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/NLT2H2300058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1735be0caa12fdca1c305e3c59072f53b93892c123dab66f8028df51889eb730. 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/NLT2H2301061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b4af2ee5ec2e4680d023bd52123928936e7936dfbaf3f6207ef18840a0b45d. 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/NLT2H2400790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8016c2e6fb91903d2b14fe273c4e77c226596d835cbd6c377a4285d775a57df. 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/NLT2H2400455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e43a3fd88e028f9cf9659d14c2cbfc2bd117b047657d7347353c6a1c281d52. 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/NLT2H2400183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01add9d7e1ab1769376ea66bfea2c2a0b614a56f1e7e488cd40abeec14d0d55. 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/NLT2H2300793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad4e70f393cd0bd5d5843499fc5c61c3ecfe9f760f83ad71b41310bdaff503e. 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/NLT2H2300404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe3519aa2edcf5e71c0b19f5e1b759c9dbf7fb7b72d3e3674ada7a5b00f54b2. 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/NLT2H2300154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101dfc26ec94d767cfac6f03a4bb24177963e7b5e55694ae402b64a4c6f5ee32. 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/NLT2H2201041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469d5cd94b8d8f58f6a34189dc563d0a44de178356bf6e423993fa5e8d5a365a. 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/NLT2H2200920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27605ca4fbbcb51229be51b45d2cfa1818225c54fdeccdbe7590259bce613cb. 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/NLT2H2200681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447337d4b112d8f37fc36ecc7893dbe4268e77f445b892118b94d6f78be2bd32. 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/QZNWX2230044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf048c33c9ae9a516fcff16f3a7697445f8beecd416a806bc07e7e94b83ccf902. 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/NLZ542101897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5639a36aaa4b24402175bdd7f602c5c37803806c629ee7585f38f4f975848d. 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/NLT2H2100824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd6c6f2687cf7fd13fe99c208dba7d3ec4188266a65fc264e3e40097e2abc48. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:02:40Z), 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/GBSMU0092663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc1dfba9f6893efa3dab75f88cfb2ad574ec2c15f610a155d616c31076b4ad1b. 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/GBSMU0092665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d515583d577e7b3ccaa98679780eff84f45097466db784e02d4bcd6b4dbb3a6. 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/QZK6Q1992236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef6bddb5851e183d41ce925290fdec20894d9681582cb80dcfc9c103bdc495d. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBKPL2022821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36666eb5d1c9c4cf0b39b8e8c2f1565ee92435992131aebc33404786b5b97932. 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/QZFZ32018337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1685e04d44368d9ebb568202e3db6303503c7c35dbc9a48abfac1bac171d9a. 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/QZHNA1937447.