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 0x9e976b1accba685c2bdd4884189d73e21320b10901133b2345fb2cbca32729b2. 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/bc244fd2-6c01-43ac-bf31-1fcd3058cdc3.json and https://artists.proofprofile.net/proofs/artist/bc244fd2-6c01-43ac-bf31-1fcd3058cdc3.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 0x55bd310731e59cd2fa01ba699d2b397d2cdcd4d3c5a6a64084c470c07536963b. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/USPR60100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73dca0bcafbae21c14fefa5778b8f5328b1da3fe9866d127a1f3ac1de6673983. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USPR60100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeedca489c77c7bad1824f2ebd5da02b8e970af65bb92655d49b3aeb7d5536087. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USPR60100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a42254f2948cd8a4e998cca2d7c89de15fef610799d3569e33bd9837bfcd122. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/USG2M1600047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x206be20137da35201223581f5c60f1742c5d84dbe5b9c5ee4fde832f591b585c. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USG2M1600097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9ba39f495a8c8842c26bb8f0665adfca1710b959e75d6015c8ed7a4f82daef. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USG2M1600100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3922a1e3e20d04936b739905231d2ff6c437fb5127901f344e1fc399b8498fd8. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/USG2M1600102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2fbbf37b5b2dc725217f814380663ff6539d010baeb84acf44fd08a3a5cfd5d. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/USG2M1600106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0a7e2b97a0837c71d0347d421ddd89ea7695ce4e0008d287478831695d570e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAER2026305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de1e53e889dfdea746a16bcad0e09abae139cd616744455bf10c3176e568953. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAER2026334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c8844a368a0c2985962f22d7968892df782c3e6f801792f4cf88d9e252eb19. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAFJ2121884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4da1a324898f13d01d8bce29618307b3fc53db8fd6364a8a1dc8da153b368e3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAGC2235791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea4b1da1f66ec956317a339025a88e5ab4edd96b6a244d4feba4e585ad53725. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/TCAHA2371546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6563951fbdd25d6b773eb8f5a82be0f6638bbacaafa6fe6629d20205e65bbe9a. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/TCAHY2459817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ea11a94eb6ec5dcc6ff8eb4119857a463264355ae1febf7c84f9c7b78145b5. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAJM2548736.