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 0xd04e33baefaec7bab7acab4c9be2ecbc1ed4376ad54beb2199332d79dffe9d06. 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/edfa611d-95cb-417e-9ff5-9d440d3fc8bf.json and https://artists.proofprofile.net/proofs/artist/edfa611d-95cb-417e-9ff5-9d440d3fc8bf.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 0xc008105603968cb7d66a8dec0fea4f76f351c4af2fb500133267ec9f6159ff54. 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/QZFP51974872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2fb1c3821685dbacd990d0c36568ceb3c7de1659e99d81e56150f9ce97bdc4. 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/QZFP51974882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d7f6657c9074b5022ebe73099829ca598b1296d1afd1f44aed81f223538e2f1. 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/QZFP51974910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4f2e3bd3d34b74bf0b3d67ad53ae37200ca2f4829c287e38f3dd9d2ef3f626. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:10:53Z), 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/QZJRC1959226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e050b3df4a3b6fadc2f04ae77c90910d489906b35378a390f1ce3cc34a1a769. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZKDK2048254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802a0cae418fd463b287d979a71ef945430d504ca4ded215ffa022d900b1c7ac. 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/QZH5E2298780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e377a23b83ccfd4e58be0d018cb6c304e3ea50805b8ef755e32970dd832591. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZMHK2360111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0468ba46b951c7a36d4aac00d406adc63367b63294cff6fc366df7f5874fa8e4. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZS652324442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9828c1582d5d47800c311f68fe62db1a4710ae371a952dc9da4404547959d775. 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/QZMHM2209772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f16468c36acf74cc3973301e14c902d76ca7ef2aeca00931b78732157a193c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZS652272704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c45ec3fc0525afb317be1480d4364694bf2f8a6b39dd5a8623ab1da3cd672c8. 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/QZMHK2296887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfa4b8eb045821a1700d7e1f472834b778ccc9a05ce92fe524b8399b1597323. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:35:22Z), 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/QZS662438364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a451695d148aed071307be85bdd7d93c8f70ff1a2184ad79358bb0a8d59c47. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:02:07Z), 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/QZMHK2419717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91bc2e0f3f1cc4f4b180385767d2a9ad89315d2988c01bcc6bcf3a8218d83d9a. 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/QZMHL2493335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555ce8bbfe34cb454bbdc88dcc280ec3b002e3b3f0fe88c0d105c55c8383093d. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:29:43Z), 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/QZS642590127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f3068877c8b45fe8c10f88d2ba9af94858e3dff87b26061a14a814a2e0f89f. 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/QZMHK2501516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116d4e047c985f8d10b106aba09b23c8295a45da46c19cbe905c96a55a58d133. 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/QZMHM2585608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1cb508bb84efc962a87694091583551eca00864fab65714a1c939525ff1307. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZS652533758.