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 0xafdcef4ceca022a2cb4134942d562b5d2009b5799bf91551d94e5d71e69f9c59. 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/ecdf8873-33e9-4ecd-91d1-bdb7c942fdf9.json and https://artists.proofprofile.net/proofs/artist/ecdf8873-33e9-4ecd-91d1-bdb7c942fdf9.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 0x5189d04efad37c07c24101b7a1bba0f66f299f1eb0083d5d270d7e977f403102. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BXP0K2500256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da9fab6d73e45b12b5b3837f9355e72d64d66d5f17a1c1659758ff54173d0c7. 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/BXP0K2500258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295109409b8ca97c5dd4cdbd6d3f3eb11ea2e6c2242a50429b671bf0c5a5a21c. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/BXP0K2500255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc9a71db7eba65dd5b2776ee56277648570ad64187d8536afe7138eb65147b2f. 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/BXP0K2500257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5c428e77f76be407d9cdd503cb3cd27a5036d7e1ca270789be90fac76f08a4. 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/BXP0K2500259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69b8903458e3852aed5fe521a0e68eac8d09628999f3adc876db31268c691a6. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BXP0K2500286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf720cda6a6d948720c0fb467a4276af2f9a0186fd97adf0027fafe6879a5248c. 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/BXP0K2500233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2277cfb1f66b5d7718b85e1b84ca0cabc4f206ba6b1cb9273647d9570a0f04. 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/BXP0K2500236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b192282a271c306a037f0a3e887a53ec6a03f643b2e8da0f8be3c46304302d7. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/BXP0K2500227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6cf52bf1959d06a4710939e22a3884ff0e23aebd8899696da45820682435ff. 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/BXP0K2500234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52bf5a60b3b7632ba3be3de2aae742f82aac1c854c170ae87fe3d02090fdfb06. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/BXP0K2500231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346a1c63b3491293593cce6c34507b4c9eecddf4813616b2007aaaefabe14e3f. 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/BXP0K2500228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30ce68faed10d784f863534e380a85c6a757a564ae80f9df533b6dd00918153. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/BXP0K2500174.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e50cb3bc9ed868bf7e1728aacafb2891febc2391f80a98c00dbafebc4b4333. 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/BXP0K2400924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502c981f9d9bdaa9bda9fe4bb6ca3edbcbbf947d2c949e766cb73785c568a2ff. 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/BXP0K2401962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c478caad4e029cb87cd9322bfbf2dc97621e95f706e7db5fe62c7618ce71860. 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/QZ5AB2487970.