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 0xc7a27d2f7f9c7319e2291ce7691f0a01be75422ed51a4a241537223a73b077b7. 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/81a5c45d-30f6-468d-acf6-46a5257e22c8.json and https://artists.proofprofile.net/proofs/artist/81a5c45d-30f6-468d-acf6-46a5257e22c8.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 0x27d09be125692c96b3e50ebf31a833297125f1cd01c44b221929b9f5bc254548. 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/BXHPJ2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c958979fb67a58567fc58e020481a934634cfbdc9c00ae32856350a381abc60. 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/BXTB72300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c958979fb67a58567fc58e020481a934634cfbdc9c00ae32856350a381abc60. 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/BXTB72300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa793b30eff889eb59d09e07eba8d9c44a658142cea6dfe47d8e11478abec6fbe. 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/BXTB72300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e783da64b8da3b40172d362398300f036ee05ec3b7a785362c3d5d41577e4b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/BXTB72300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x321dd01ada47c7c2e5c1af17c97f579958d2298461d0aa3f3582ee076bcd8a92. 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/BXTB72300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30824e37b0c6bb03a93a289af4f43e316473d4585ce15ee3b10d0b56d56d827e. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/BXTB72300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729455caaf5371c5edf3326cd5dc5ffc3edb1cb0a6d0e0c9066c68c59a71a7f4. 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/BXTB72300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc21a18a9e0fab2637e5a50881e1989c6aacc6504d579fe35156de3496015e32. 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/BXTB72300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628d9e0dceafdc9a9c48af2c8512d6879e33b724ed3e140fec19a1a2fd40be9f. 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/BXTB72300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d09be125692c96b3e50ebf31a833297125f1cd01c44b221929b9f5bc254548. 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/BXHPJ2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf5aea8844bc8991d722e926500d251c1dc678ab8f5714f5819e2ef0fc73aca. 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/BXTB72400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99cdbaccb501bec2e631b08acd8b13cd14b89eb97e593094d2fcbc8b865f40f. 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/BXTB72400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f4b5069e110a06ef0f6db0c8b22d7eea2d06fb8205d979118876e7ce871da0. 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/BXTB72400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a573fd6e5d211588fa7a5a8b09fe9e8aa1b7575cff377361b2a1f81020cdff8. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/BXTB72400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1847b854f7953f26b65ec8873b130cca9b439255a2e72801cf3dae202feed7. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BXS1I2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4ac221c0fff3d660dbacdf621cc0ffafd2053472091f8047c65c7596622097. 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/BXTB72400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdecad2c5f238484d05114ceec7736c128c0de8a9da2dd8a5b531d735031fac77. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/BRAGL2200038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb189e2af94e6480bcb0fc8483f09c580811d27ff983392d612ea59f7250cac8a. 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/BX95V2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe355f352a9e2fda5d0f1213ad5d1b07538e5632b65945f516822247907301730. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BX95V2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb189e2af94e6480bcb0fc8483f09c580811d27ff983392d612ea59f7250cac8a. 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/BX95V2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3990af2fc07392d1336f06cc5df6f440984a5c5e2e76c258b1ae205daf4d526c. 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/BCIDA2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0b15445611788df609917befd0c8b359432a568f05e4f914847aca20559430. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/BCIDA2400007.