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 0x46f26f604cdecb41d585c1b81260615f3b1941b1ced536e122aa0e54130e7e53. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c3d0af16-c304-4d0b-8b6c-766b64e7c49e.json and https://artists.proofprofile.net/proofs/artist/c3d0af16-c304-4d0b-8b6c-766b64e7c49e.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 0xcd33b59f4fbcfb1ce0274f2a82ef0923f5e17ab9658227c586d03ced5fb46160. 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/QZTRX2473107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271c62b60c915484b57bb8ae46b557b741264b9f3a3cc3b4f9503986d5594dcf. 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/QZZ8B2391240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eefe9c5932ce513e9b7a38a0836fbfa9b58c1ec07f9231ada10b914a6c5b943. 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/USLZJ2308417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b49c9176c455cb0db8a06f2c4b1b200ec487ebcc32d6cde3f2dc8192c1fab8. 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/QZWDE2257389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2d2e776ae7b453d880a6b7f090ed6ca229ad5a335a013c60b57917ec16d558. 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/QZWDE2358150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27cb7248eabb3ff5c7001f70d533431ca4211afbd6f385fa871cc9a3a1b02b22. 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/QZWDE2358152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fdd0698c88ee30887ddae151f2805f64654496138a4b9bb1291465ebabd49f7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZWDE2358153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958f3b7318e00b3dd09f200eb0fe72809e6cb3cbe2afa023db25eb831c5e45d7. 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/QZWDE2358156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05dea99595e1b5c3c17ee0150daecb6ebe9b95369a647036155d2f0dd2af13ee. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZWDE2358159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd762ed5762cf40013ee9b132f41f2116002a8362eaaf5e41462d6e510a3e7626. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZWDE2358161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3121735bb845b274bb61f40fe6c45d54d4236c8384740a9eea73a82bb489c5. 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/QZWDE2358164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d889113f9ffec7a45e056896ef4da9eb09f529ae131302515222c58317a603. 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/QZWDE2358165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a07cdd3e02f55475616a2f695583ba885421b701f95ea103fefd5d14ccfb74. Chain 2 (Bitcoin): anchored in block 960101 (2026-07-29T11:46:30Z), 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/USLZJ2370226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb353e30108451e022a2bfd53fc3c7a2540e92e06d1a586a497348cdf8d49a501. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USLZJ2370228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7df7367f001c107b8ab5cf284759714d4de5f874225a0665cc5eeb1b58eedeb. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USLZJ2370229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ddc5b01199f7f08e3be0d549acbfdb1435a83cdd68651ebcd14e7a81787bc1. 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/USLZJ2370230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40fc3437389b3b3bb19849aea469b8e45680399d943651bc1b8797adf98a19b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USLZJ2370231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfddfe0524ff9d57b13497335c37ffe9da8dcdf3ffac349d25446633fd27017e7. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/USLZJ2370233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a33ae12273c75662e87f8b11d6ea26ce6e08b30c28f4b8d7005ba94a478603. 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/USLZJ2370235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba84fcc5725d3e605cf826619c0dcf276ae3510763542ca8e317df7743359d1. 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/USLZJ2370236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a257dfb19eaa241600f79bf9c4a1e19839e4f0feda600fd3b3d07914364b27. 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/GBRKQ2436272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6095da407d69e7cf96c8dec51622d84b09337b38f37bac0ba585562c59b296. 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/GBRKQ2436274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb4a0b8fe201da7ab5815619615ee93e3dc5c186228e1660c02ad47434aaf13. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/GBRKQ2436277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5595a3ce40c765b229d609bb975b8a4dc7fb88a01c17134fd03a0822fb8fcfd. 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/GBRKQ2436278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e0b6c26906acc119c5b05deaa632e6c962c10a6ec96e0070d1e29652f437e1. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/GBRKQ2436279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5a8c4a0597f1249cea5f474dd2065c7f3a7560fefaa0fd5a35e1db899536e2. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBRKQ2436280.