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 0xf81a0b4e815b98762310068b0db63ff28058c87cf3c7f2e3192e28263547f1be. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5fe0142-532d-4216-9969-77eb2cacc8d2.json and https://artists.proofprofile.net/proofs/artist/a5fe0142-532d-4216-9969-77eb2cacc8d2.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 0xb61966d8b80854c5c4bcefee42c7392bacc69702d8dc0954ffc4c9190f038a54. 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/PL14O2200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea84e2c32a1a2c9b6e34519bf429b13912d95cf304afd23aa485584134d77745. 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/PL14O2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49df3812ed177e65e13ddcee14947603131c0d6bd306272d57c3309b9096ee4e. 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/PL14O2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f724947aecb28474c22c07c09b81538bda19b9fad10a31b114fbd93f3980ec2. 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/PL14O2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b6c8a16c8f6861b6899e51bf5bfd416dc1b9648ab2fdf89042b1015b0a5b43. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/PL14O2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f8c73fb8ab8846f136077b9e4abf86f07afd795f86d4658eee2f617e4627b7. 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/PL14O2200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403fd91b8324bebe8750ba9f6c354251cfe2b38b5bca37f33025458f875a7118. 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/PL14O2200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61966d8b80854c5c4bcefee42c7392bacc69702d8dc0954ffc4c9190f038a54. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/PL14O2200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7dd831e6a4aebae8471eeffad329c60bdbce2e068c93400834416381aafd2a. 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/PL14O2200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf38fd269ab478abb5d18974b9635b33a96c7eecaa6e75d017164e136ebfb3b. 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/PL14O2200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf38fd269ab478abb5d18974b9635b33a96c7eecaa6e75d017164e136ebfb3b. 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/PL14O2200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f8c73fb8ab8846f136077b9e4abf86f07afd795f86d4658eee2f617e4627b7. 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/PL14O2200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b6c8a16c8f6861b6899e51bf5bfd416dc1b9648ab2fdf89042b1015b0a5b43. 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/PL14O2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f724947aecb28474c22c07c09b81538bda19b9fad10a31b114fbd93f3980ec2. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/PL14O2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea84e2c32a1a2c9b6e34519bf429b13912d95cf304afd23aa485584134d77745. 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/PL14O2200002.