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 0x843a027d8697e283f772551fb7df2248e3ad5f541ab3a08efaabe5013f5c19db. 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/c74008b5-c3a0-45e8-8826-e0213976ad03.json and https://artists.proofprofile.net/proofs/artist/c74008b5-c3a0-45e8-8826-e0213976ad03.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 0x5fdf70795b57fbede6dcc853125a6b65d9e985853987164fcdeabb5f8b5c2386. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZFYZ2132946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12db3a243cf2468d71a9e17ca23ca74c9c4e1ae1e91b94646adedf69ae6081a. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZFYZ2132947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f62e066b5bcabb23a5b3d22a8b4d4d61f7e551c45cc1c9e73b3f394bbc6db35. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZFYZ2132948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ead6f64c150d8c12840b1f1d123be9926eaa58898e517fc2030a197814561d. 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/QZNWU2187926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde110a3569fbaac9cf085206ab606b45a9c5e59528cc8f8d4b4f446457ede405. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZNWU2187927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959939f80ddb1873560f78bdbb53bf839bb37611cf4f5c067c49126dbfac55e7. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZK6H2292378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2bc83a485d0690ff37b203474b02eeea565a053ce748730a61bec5953e63b52. 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/QZK6H2292379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13af0b8db49208209fa2960f6d566b58522c29225ce1522823d9b7aa3dbe80df. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZK6H2292380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14cc6f2284448125776223993dcbb2a52cc14602bb5744981f56bdcf03e563b. 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/QZK6H2292381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe0cb24597e3886ac84c1292a06d6c5d48a3ac69e91d7cb0d951791dae14162. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZK6H2292382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9780bf855544d9978cbe705f74d1452ed5b96f01c7088a147623503c0a746146. 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/QZK6H2292383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa030b449b63122ea8676a0e875f3df0394aba36ed561a6b48bd8bedb6b2469ca. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZK6H2292384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1452e56fcd05a87696a60477c8f4ec7cfdce418550d7c4f1312f730dce5b3df. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZK6H2292385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2f0ee12b0feaec24ea8b10e504a7b4070067ae79a3ba282d7dfedfbc3e1d4e. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZK6H2292386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ff8a9fcfd1c4661ba789b4a35f4caf10e655273e72e70165108cb0ad321862. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZK6H2292387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d572d652c4ac639e029ab49f9ab91faa46c75b37073b6a06c1ddec561b3cb3. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZTAU2310570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4f2899182451816145f504bb9943a3c23b8621ddc394ccd2fe20c484f497ee. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZTAU2310571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b198e2d2a8898a899c5344d082860e98ca15a83643a550d2ebdbf7875c303b9. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZTAU2310574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405e44b0eee7deb0ce6cd9c0d293ea9d6cd96ca9e9a7557f03c310cccf7eebd0. 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/QZHN82473007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56955a113b47ded31e9b3d3c198dd3e099b23c096ecac67ab93ee5834142dcc. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZHN82473008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4f2899182451816145f504bb9943a3c23b8621ddc394ccd2fe20c484f497ee. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZTAU2310571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0bc5c0e01d34256832b162fd2cdb8b7e776b2a0cd7498d963f652d00d6e76b8. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZTAU2310572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f9071a995448290ef6d10b325d5d6d0c103fdea36a12d5ce0f30da380db5f2. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZTAU2310573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2161c3a65c75907224cf4775bfd43ef5f0b3884a09c8ac17481c0782ac183d3. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZTBD2416953.