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 0x110f119fdf1d56e209d5294388e5f879fb5305cbe1b3c7d1b5d605986f4861e5. 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/259ce6d9-8f59-48b3-94e8-ccade9cb3431.json and https://artists.proofprofile.net/proofs/artist/259ce6d9-8f59-48b3-94e8-ccade9cb3431.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 0xb07d739bb0eb07a3af9fc5470a44890feae551a376c2421e2c813e4bc6e58c31. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/NL1LE2001340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9868eb566996cb51514df83a0bda3fb3884265f1929afc5095861fc6d7dd4506. 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/NL1LE2102311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b4650914055a051480bf6a483a1a6ac3e5fc3a4042ab8eb16afef7379e3ded. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/NL1LE2102312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393087111725496d3b7e8bbb3a51179ae72912d0e4179333d4192ab8e2057969. 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/NL1LE2102514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0c0c35350e67206ed46e339b848c1674adb2221b8d2250f29cb1531b104251. 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/NL1LE2202695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4744410b41b99ab4b9a649b4eb328799af7ea61012fea8f5e1ad54478150c2d9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CAN112300093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393087111725496d3b7e8bbb3a51179ae72912d0e4179333d4192ab8e2057969. 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/NL1LE2102514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db1194c5503151d6b7773c098bad0d29e91f94da4bf6edebbac400190f03f2e. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/CH7812195196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf9ecc8145f312de6c6290d6c89964f5d0fb77b820c4b213a67329336431e8b. 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/NL1LE2000761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4554da377866576150a22da0ef57a528d8396fd0f8ca17aa106f636749a38197. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/CH7811821805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5400700db73484f491be07e873cc965803e2847642b1de79cff72110f57211e4. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/CH7811821806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed53a8e92a74760f9ddfa9d51c3587cbe4869e418688f28f12cb705784430c7b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CH7811821807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9333c6a90176917ae0804b1515bde39f6f73c68fa9fe0c186cdb9e0f5803860. 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/CH7811821808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250daeaba90a9599fd9b2deeb3357cb525e67e026d48b2c9fe2e0f4234b48c53. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CH7811821809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3c4f041cdad2f8f2761d20d7f54911d0ace2a982a1bcbac3c20f6e010c9079. 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/QM24S1927140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b26303a5aeff51661c6eb617b24bd1167bdbbdc72fefc99bc6fcbe92cfe7d78. 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/NL1LE1900123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4ebbef1f78ac52bb1ad5690c0ccdb3f7bbbec31f88cc40c0490b7f2b733fa4. 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/GBKQU1823915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807ce604548ea777d9ad2052fe2bbb4ccb21e3f9206b99d3b649caa680330786. 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/GBLV61811331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c34b77a351645b5619d010ad425b275e2c7262d3f46a82679b986e48083f88. 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/CHG231000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f27e2639ee13b1e194484b1c570fe8d90384018362c9b45f1ef759a0501b68. 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/NL1LE2403552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2849a5610b99548bdadd57dd584742675ab1fc8778e8accc6989086c3a421f8e. 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/NL1LE2403657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf9ecc8145f312de6c6290d6c89964f5d0fb77b820c4b213a67329336431e8b. 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/NL1LE2000761.