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 0x414fafe14efc456ec873f778166085e2850c4dc07310a422cbd40c766783b12d. 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/5856086d-cf10-4d4b-aa69-4535d9a76bb7.json and https://artists.proofprofile.net/proofs/artist/5856086d-cf10-4d4b-aa69-4535d9a76bb7.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 0x6fe8c83c087340f99a4ae1070157be447dcce971038b731ba29216834ba8431b. 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/QZPLS2471761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae9d540ce1e6d4572f44a309af941aaeb3c5ac2582d1b3d87ba9c861cc2cc79. 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/NL8RL2425715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c8acc6e0d252443664cf1c06cade2aa25c55de5331c04430cbf2807cedc38d. 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/QZNWS2491785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6575e149b65555ffa2a5e6bed74dfdb1eef23a2fcb1ceae1759685531da2c48b. 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/QZMHP2456163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc589b7c8afe31ca98440355bd936288360ddfed5512e9a42519bf70bd2bcb01a. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QZK6F2430882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84eb011217489c62855f8403e49e57dd9b656e2a97718d81b4aeec121d3e77a6. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZK6Q2427077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1bcca81acf6a6166877674d6aaaae9fec10203151a4da88838d34f90313dd7. 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/QZK6Q2427032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2191f3988fc3cd977066a252e9b3f9568faec6c8fcc11bbf70ffe8794826e463. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZK6Q2427037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57331d3e8d269a7b82152b55bba15ba175b9f542d67e328d46da3f87985486e5. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZK6Q2427038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19d28797ef555ca28e03b09326c3f487a74a8ab178f64def361c0c63f8a967d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6Q2427099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16fe7b69f9426bb9c926cd2d4ba45d0f24f5274d1301c181b474be58d4c4ad3e. 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/NLFL72400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0b9a4595e3b2cfcf6d31d130f67afddc664946384c806f4956dd23e66e1c77. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZK6Q2459628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a20bb5e08984dc4a085558e429f93f5928515a33e5aabdd47c38bfbd4aa065. 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/QZK6Q2487358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305a156196199c2cd24ea50ddd99720319cfe0fad64ea30b10777583026b3eb9. 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/NLFL72200160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180a6f08d4f99ed3ea87f3c9f7bb762424c2ab5d0b9f0dea0284b6d0fcf1d3a6. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/NLS202200336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96efd386a11292c596aa376ab074dafbc4f046dbb5c28f026801c1e1cd5fdce. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/QZHN42312026.