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 0x4eb8691930df0813847928222a2ad272f66945c0b38c832f3e1c97968143bf78. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/60ea2c27-4231-46a7-9b0f-e5a176744084.json and https://artists.proofprofile.net/proofs/artist/60ea2c27-4231-46a7-9b0f-e5a176744084.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 0xb351d6e19fdc5c53029b6ed9d8ade81f1a61a7cec7d04d06e372e15c1de950e7. 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/ES71G2301765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3e6dc763b7870f671fdb1241ccce1aba32a98e8b449f43904de8fc90872139. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ES71G2415390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84b8aa9149357e26f9c4753a852eeb53ca583fef9594a5ac307201826335ed0. 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/ES71G2404730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3e6dc763b7870f671fdb1241ccce1aba32a98e8b449f43904de8fc90872139. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/ES71G2415390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b342409db2f48ade6a6b4e322685eed490cf3061deec522cb3eea7d5f367594. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/ES71G2431758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406ab55d7756b8c2dfbb957e1c8c5dcfe383b4814cb5a14b56f0746b97753905. 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/ES71G2501442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb57255df62137554d9b6a454012b488b2923aa2cbdfbfad63ad403ed4edc835. 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/ES71G2420907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3342e63de9b5aab36a738ee54620bf1ed598f990146fc44575b1dad25d33a68. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/ES71G2505115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b2979b9a4e0f42bd2e0fa64f6305367223756ee410ea6b85dbbbff76ef1ca4. 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/ES71G2505119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb117b3711c8acfeb94eedec456ce8207ea762c8c8b7f9e64e1825c2cd6fcbc. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ES71G2505117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c98366762d08ce8cfda133b85848661d4f06d226dceea1d7b27b422e36455f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ES71G2500346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4a582c79acb09dfe353c990596b93045a48eeaae09869b81e10c517786dd09. 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/ES71G2505113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad891a8ff49f4c0ed37b8de7c06096f8731ddf1a0097cbb4ac2dad6dcc8f552. 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/ES71G2400554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb351d6e19fdc5c53029b6ed9d8ade81f1a61a7cec7d04d06e372e15c1de950e7. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/ES71G2301765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df3d7a80ab54d260fe298767904be2f15fc632ad161af95819e6a9bd413a377. 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/ES71G2411927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b342409db2f48ade6a6b4e322685eed490cf3061deec522cb3eea7d5f367594. 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/ES71G2431758.