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 0x1182ca208fc6ccd4082de893f6fcbc0daacdf0a19e036c311f070a388bf748f3. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99a7ad71-6329-49ad-a4f6-0fc1ffbdfdf2.json and https://artists.proofprofile.net/proofs/artist/99a7ad71-6329-49ad-a4f6-0fc1ffbdfdf2.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 0xcfa71efd9b236025454e7e01b184ad0bec2a9d5fa8e356b4da26be379785b561. 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/DEHC20965381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c53415b7421497dde25e74c9b3a97c04b98ea2c22e2142b6cab653496bbe08. 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/DEHC20965382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d5bdabb4715c3073d602ddfed9b28a1aa8444387838bbd27051f99135b2f7b. 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/DEHC20965383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243b6c437c9bf2a256141222955316ff426b88cac5de4f0128e1c4f12782f350. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEHC20965384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a0be532b4c33fb0fd9145615708c73674cc9e45616df379f47abc512a09339. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEHC20965385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c613e5d2440bb96e57bb2c0cb2e9ccbe4e4b2bc656d92b715505ea51771a40. 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/DEHC20965386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912f6342d888b9a6a2d7a36ed7fbc1d53e197ff1af6e759cd1b608259d416547. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/DEHC20965387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff0b2bf250747570c9b0cfa42104dce6e8fb438b71c34ce478c6e0d9488dd1a. 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/DEHC20965388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec7b504e5ae4296079c0d9d7d891ba52206ca621e5e8ec93f7d4a668531c0d0. 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/DEHC20965389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31efc13127a5238aca19d16cd356204f5b165d568bf5a37647efe18a2ce6d4c. 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/DEHC20965390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d39c38ac24b488fff0ad28203d0c7e278437b46ec791957daac0ea8e6e568e. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/DEHC20965391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f4b6cadccafeed2d12a4743910b1dad895d1dc8309b77c33b84895fabd3889. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEHC20965392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6c08e96f9ce94cd87df1d9f24c2cf92bab187f09f55f7b11f669d770a1e9ff. 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/DEHC20965393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b7e1670b328f906f69c1ce510ac632be544097dea9e8dd1a066788b3ec0b49. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/DEHC20965394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc843c1c239d68a443cd13f29e39b868829978d5a5aa1af4f709d4ef3e8e5fc9a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEHC20965395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18c68cae599641611da23537671de661899c9c6d85193a999ee4dd9ba90cc21. 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/DEHC20965396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23edbfa0ba556994c3f4bffba9c8f0e5b09728ced38b907d32780fe70d33318a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEHC20965397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3bfd5decd1ea13bc2416cf4cefc54cf39b33079c61c831397b5efb131a0a57c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEHC20965398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfece4eb4525f4f6d259832c84b5a49014d7afa45aa723f1283332e8cc3b00a9. 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/DEHC20965399.