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 0xf8777556b84636465c03eae61e82446db9cc1e88362922781598b25209870cf8. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e57fdee7-4a28-4b6a-83db-63f8f42f111f.json and https://artists.proofprofile.net/proofs/artist/e57fdee7-4a28-4b6a-83db-63f8f42f111f.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 0x9fc3b22e65593337a3c159b9e24910b8a406214f515de64d6fd7674551e50b54. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES71G2316684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d5a14ebd6812a1e4ab869a59e8c285d793563f30e279bc94f9e4916014f1d2. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/ES71G2211361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7c61d36f334a620eaa21bac68ee3621858a5403cc29c55fea7768a76f5265c. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ES71G2327306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9763ba05b2aa6ed05899a370888e8b559d9711aa38b4b95317d896d0088b72df. 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/ES71G2327304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b020cce01d3989c51b05f4cf86c1c54c868555c6138ee6ff10b6fd2a896e24. 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/ES71G2327308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a0683509d11c84ac0ae8d8f92c8a18dc908f08f9c18d07f8f6d2eb63316ab6. 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/ES71G2229773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42ec62a2d52fba2b106cfd7a381cac1d76f487dc8efac3774df333a5f998301. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/ES71G2327305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a852e7adf92ecfbd5809ef52eb29a096a28eb89de58750c54e97f3cc75ffea. 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/ES71G2239275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc118c6e41fb4e55e62a9608fa51ae6fc31875eadbb236f11a0ded7964623fe6. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ES71G2304668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20224e619bf1b5c186dcf8d3bff2fef9c7e7bcb742c2ec417a7ae847c679997. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ES71G2327312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e2ab41d93a8e169a5f35af9cf5320e901c517e00e010cfed2f95aecd1f62ef. 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/ES71G2327313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c2370c2d84600c585082af55c1cde0465965d0254a32ffa675d875f177bbe7. 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/ES71G1838726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d8b74404e7da008df532a567f8c5e68cd77fd37d1d220253ee9d92688207c7d. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/ES71G1927576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81c646b438fb66c446c62dd019e11c2db1e17d956fd245ae13262235acd851e. 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/ES71G1927577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2101e585391693d1ed143951c6025a90bc2827fb864276a947ce466d6c27dc89. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/ES71G1927578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1feec39470b7289d03f004bc2d23e83fc4fdc4c1a2c04422ec9ddd5e4b126196. 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/ES71G1927579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a83b495a706021d228b7551ee6cd462c722cf9b743ced284208c63b2f986348. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ES71G1852869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b020cce01d3989c51b05f4cf86c1c54c868555c6138ee6ff10b6fd2a896e24. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ES71G2327308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc3b22e65593337a3c159b9e24910b8a406214f515de64d6fd7674551e50b54. 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/ES71G2316684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc118c6e41fb4e55e62a9608fa51ae6fc31875eadbb236f11a0ded7964623fe6. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/ES71G2304668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a0683509d11c84ac0ae8d8f92c8a18dc908f08f9c18d07f8f6d2eb63316ab6. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ES71G2229773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d5a14ebd6812a1e4ab869a59e8c285d793563f30e279bc94f9e4916014f1d2. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ES71G2211361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77730a95fc562af01b60509294499a4f3d314314719e0a37ebb11d323a5f0004. 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/ES71G1866089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a83b495a706021d228b7551ee6cd462c722cf9b743ced284208c63b2f986348. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ES71G1852869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c2370c2d84600c585082af55c1cde0465965d0254a32ffa675d875f177bbe7. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/ES71G1838726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8fad58e3b6c057077cb7c10ad151119a196dd616315586b854e805aff4c363d. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/USHM81671418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938a84eac768969a55d754c5c70d7976122264b73f40c6e423786756a10d537c. 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/USHM81671420.