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 0x16edea9adde35bb14197b233d6d6222d3f703127b4ec022a3a493d49c05fec8e. 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/f5c67fee-953d-48bd-a3cc-a1729098e165.json and https://artists.proofprofile.net/proofs/artist/f5c67fee-953d-48bd-a3cc-a1729098e165.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 0xcf2d1f3c127baa0353bb845dd5c425f98395f9f02a26282a614102647b64ab50. 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/USLD91750887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5a924b5305e9619ee635ae52a106392a53d286b6e900280824f53bed744bf4. 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/USLD91750888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4faab004c247a2f5670561e199f0d8d2c347f6a90dd23c794e7b0eecb3027839. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USLD91750889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb1ad885788d9877c28f65fcc40ccb4fb732e9e7c1e6ba580b71dd303dfb4d9. 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/USLD91750890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28e8a29a79c99b6a2a2ec016c2c31b9576e6787af7788047b61e027f2f88d60. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USLD91750891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34df92cc13124ca6fb1901bf31ab828a8ad135f2c400e68421bce4f1c37ecea. 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/USLD91750892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c6e167b50ba7992b4a706458b3e7a634b7389c9cd682aa487e71019bcd4842. 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/USLD91750893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9862de5c690f636e193abbf4ae8a2791cc8a4193186aace34691890824b1804f. 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/USLD91750894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d58b7547ed6f37bfe7007fd6d121feccfbcf516843844d38b74b64d912f757. 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/USLD91750895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a59df00346c9bc61330b18213e48e4fdf3eb50561ad55a91f12f3fd85f13323. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USLD91750896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44429dce0e549385a1af0dcee6c1e89cb27fe3cd7e97436778a45bb4dd208e72. 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/USLD91750897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6679392dd28e43386d7e6339ebf48bb79168b43ded5201b812d9d9fc1a37cf6b. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/USLD91750898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66cbc5d50f99d52bb1a8803e167e106a9800b8f6383f1b3ee603800af52c8783. 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/USLD91750899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648bf070bf9b0ca28d15a6f7f31db50af446b3bdc351343ec0238e53e9cf38f4. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USLD91750900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96115d4eceb54e24bfc1af5ae88bb9c58aab727c54d9ff0d453febb2928b6b9. 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/USLD91750901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e54d68b059f431f987995ce778e8634f69308aa3871172d12e6819f38646ec. 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/USLD91750963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d37f27b2d7283d133f96bd0a17dc6f4a3456f895cc67e9bb2af66eeccc4bd3. 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/USLD91750964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c0ffc796a186a817e8005c3188ad0eb1d08145c12d4da93313c3786a641465. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USLD91750965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682b48a3a307161adde844c0ec1488dae754c7f6647783ef5779700346b93e36. 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/USLD91750966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa477b0f0d7fcc3393fddeec9bfd56e1b9c3d07c101914bc15165995e2b14764. 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/USLD91750967.