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 0x978140afbd8847b4daf9d90c24daebbf945eba59c4e63cef5637741406dffcda. 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/cf123396-0a37-4431-b4af-71e07dc506fc.json and https://artists.proofprofile.net/proofs/artist/cf123396-0a37-4431-b4af-71e07dc506fc.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 0xf3517db85a24f58d82c8b8a9084be7b4db1784e4612bfe22a710909e0a18b76e. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:59:14Z), 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/DEGC61301191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17804c3e8a19b450839856df3126bab7c517d0b855b3431571309ef4a6d967c1. 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/DEGC61401282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d6b8aab2c6f2c11ddbbb97b246d26612aa1739e4e83e041de3277d38feb478. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEGC61401284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464ffa9d0cc3f6452f98a33ceba7fe121b89c8999ed954704f49db66026a12fa. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T18:57:25Z), 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/DEGC61401293.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5064177ce3ad1300f658e277cf5c34f9859f1c1ffb6e80725a784798c665bd. 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/DEGC61501465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd72a65a3325770db8f2223a878e0b40970e25a3f5fde6dbc286f1942f74e158. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/DGA062074236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce9834cacada95ef0d83d83a2be806a8342aeaaf5bece3968aac3e3ce2bc020. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DGA062074237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa480c3e5bdd544bebf6ad2e704eb2d94f117d8ca9dfa625b13f84ae9e39eb9c2. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/FRX282496957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x315b3ed560baba6ae0cbe7f6e89432ea2780e7f66a7b07aadfc06ef569e3089c. 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/FRX282496993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a906c9aa2936e85e54fcaee4a17657a17af83d87414061a470a3c9a5623da50. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/FR10S2577005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddef0b1436ca03cb6ba6aff919cf1c9dd20cd3839699c871e988ede3883f06ba. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR2X42535642.