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 0x0af59406e0ffe994919c1f080a1f4a7453c2c1d218295f1d3a46575b99e19b29. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ff493c4-a9f2-4d91-a7c0-c700a6fe8bfb.json and https://artists.proofprofile.net/proofs/artist/5ff493c4-a9f2-4d91-a7c0-c700a6fe8bfb.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 0x9f8c6efdfd0a23afe096608d0452e9462b8d6b1ec359fe92361d0fc1e4d84fca. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZTAT2332460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd031091889193bbdbb5d608cfc9af83e2d497f56346965992d52c361563e14a9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTAT2332462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ed2417509c026df0e6e2bd938fc80f81a68271a31b8b224c3e496430811ffb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTAT2332463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3943982c712b1aa4d8ba8647f86d2a56ba94e58f98ab001295b6903d6cd2ec00. 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/QZTAT2332464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7920ee61e99dc4d403e93b6a89447eee1a71ee9055b38e085839ad99a25ce4a. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZTAT2332465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2542db34d14906bd74e843cd7ab0663c92b351396bfa6b5b9701f9a0f12d004. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZTAT2332466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27f6b1bf327c99900930fe42448848fc2caca2f486c967fb910e8ce3295ff49. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZTAT2332467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4da1161be9b92166608a86f40b0e9a0204fb4a9b14160c8a8777d735135febf. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZTAT2332468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a395350824ac2ee4ff0031dc27ea94179175fe59db538cc54feaddb3cf34dad. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZTAT2332469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543a08f3a9d5fca0e338137c7aa519a8b71b42227ac2a0ee30233d8c0f8ada27. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZTAT2332470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b49b689f62f1f845b904aa7cb56463b372b4d9395a9a8305755fbc302cc072b. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZTAT2332471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x315e32c7dec62a2dc606ee674fe7184ba43ed08d4c7f24a4911b48c713b03d6b. 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/QZTAT2332472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a5d2ee0cc0d239300c6974f358c08afe28610c387eddf40a7d4169501d51d6. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/QZTAT2332473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596fea7bd0092f9d6b7bfa13399595459347d7af395831c4cc34fc408e665025. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZTAT2332474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc165b30719a87589dfd33c1adc5477a799fad04a52cc6772ce7e6e54e1290f2d. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZTAT2332477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ae2697c713c1095e1801e13dfcae8ace8d6222852dde5788360bfd9c9bccc0. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZTB82345103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d60f98d25854f4369064de5cdd20decafd69481d5fa84d27db4fb49d3ff2f1f. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZTB82352779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x494b873aed9c068f724e8ef6be56842924768070c998a506b8504bc0614a1673. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZTB82348483.