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 0xa2ad78a3b248afd996a586f28b40366b73a97268654043cd9b54419f09051bc3. 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/5dd9f2e3-ba31-493e-8fd5-133578a7dfe9.json and https://artists.proofprofile.net/proofs/artist/5dd9f2e3-ba31-493e-8fd5-133578a7dfe9.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 0xac8786cc8b9b26e4c635adc43828bbed491a6c5b931d93ad404b694ee2cc0568. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZTB62392703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689d263c3b2a9c1ec8c10ffa6788adde59e71384d0cdd47ee55b017dcc6ee63f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTB62392706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba3c74c9a982d73282f377a80dde785acca432eb40d27ccbb6a002b79acfb4d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZTB62392707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce9eaebe2e50e8e3f54ea078fbd8a8daa04729f9e0684f4fdc6d52617db525d. 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/QZTBA2360521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9869058633c01e45ff15d3b6de81b90d26c9883f4e9a22cf7bf0c1b5926fc7b4. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFF2360608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75a2f90dea2c7dd8a66f4322789a8636509fe85e89f223c519ebc679f74d3fc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWFG2391763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5269223408bf7fd47131b52aa005680b49c5897dd1c1f6a355df631c4375c8ce. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHN42428585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd175257ad3809233f219af0e4dcb3e0816e63ca38e2ea9da94d630e3be59434e. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZHN92451582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71dbfe500171297f54124fbdbad94c4526b0f6b9b8534a12a46a1c1a375d230. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZK6L2438775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed408794bbc26698a1a8f2f0959014e508d967cb1acb31d2aa3ee3546a5b2a6. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/IT0R62400060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6048b80ed26b291ee6cb6cc85f23b02e33b0f7743b86dd482669b7640e5c5ef8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWFG2461108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e27d817dcdb73d4c0fcf1c4013897cae00cb96253c65645491187ca38c1087. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZZ7P2464796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef791027db0c232f994867dbf9a246b99b5c1422bdd837baa0c67c9d98a5ddcd. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ITE952400346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755f1c9a2b93733b261a99b764407dd28704059c16447e7b64ece04f4f961445. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ITE952400347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af9c0d381a37aa74860e7cae09c436ed457577b4aa4c66460b75689f5ea7d1b. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ITE952400350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c6a5078bbc32d7178c834a7e315c6f2c1b4a9e4dd6f5324d8c35edc1fb0df9. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/ITE952400351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd9939f805843e928e95f77a0125c576f13f271ce61fb5985465a8ff2627a67. 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/ITE952400352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f37b24e41c44bfb96ae200b7e15bd7b7d1b835f79e3e7c9cfe31e99cdb1a6a1. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/ITE952400353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468c123a1a42b1cb3d53b4d55bfc6d1ed9e3c94cda549d7133c21ac5b616e460. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ITE952400354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565d7d5f19b701b4cf9f2c77b91a569121c9ae10e8d457be3ded5e86bffc69ce. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ITE952400355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4b6043bfcc1ebadb9cd3c6f387c907c9bef69c581dbe13cbb404550235d014. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNWZ2583427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa073e8e1f362870e7c6f53c6ea0d44009eb49a577804c7e20627c611362441c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWZ2583428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3150d227ad32b3b134262d07e0acfe1db839916e88ec3fb783403ef98e6166b0. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNWZ2583429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c95bf539728a9e554a0cd1f5e2dfb31d49e3230638a844b4be178cb5aee34b. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNWZ2583430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c35b294becaede926f6d79a14f1a32ea7e2ef700c18523934072e0b9cd199de. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZTB32553465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ef0d39fe8c46d081916e342bfd7329459968ad32fcb8e00c08c2b8e352ea0e. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZTBA2563162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0558b07c391b16b196ee2e84633475f9a4ceb8c94ace4d22492624982f8054e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT3EX2556175.