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 0x497a4fc5008581c5e645746b3ff6b9bfdb51d06d83771ed746da672a144cb5e0. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6634e070-48b5-4b40-8cc3-0adc3457750e.json and https://artists.proofprofile.net/proofs/artist/6634e070-48b5-4b40-8cc3-0adc3457750e.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 0xfc7d459ba4f021d3f78e679c355ff2bafe6a03332fd7dcdd9ee66a98240c8962. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FRX762467935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39289108863f92e919241b73f611ed6cafa648dab0a448a6be55179582c3aefa. 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/FRX282359388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa3731c0a1de125abec46ce64fc356370a7df00ab6636cdeca02b324f32d668. 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/FR96X2342539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ff1e58d19a27133e14fa0b2297847075a1523c85645126ea80fe21405a076f. 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/DGA062218427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6876ff87d4f2ff230fe658bb42d8eed572544e2a9f1e9e41411334ed1c74e30. 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/FRX762239432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe866bb06bb0ef5d9cf3d2683f5dcad9e0bec4d3ff957343473df08a502eb5d5c. 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/FRX282226281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87e854f444454185fccde10d2b986ae27bc512e0e5a19429c2fc34c75e4771a. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FRX452255407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4adb9d96ec15fdccf0e515da1859e34dc8ef553a5ff2d18929add3ac2eaa2c81. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKG732122359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825f00de03803738eac0243dcf753417d2234da603a13d0a5c4beb9170e5dab1. 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/FRX872198553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14a9e74e139bec6d7d325363866173e794c59f7ef083b2e36be3a65451d36a3. 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/FRX202243792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25ac0a0f76b85601bfe86fc1c9e9a5ead6d9d6eb674cabb724a4799f56e08f2. 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/FR59R2201812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c665f05eba3e612614732cd46e05bbca6e6ec0d55a4a6b151f6a6150faa9155. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/HKG732128139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef667b3adf55cbf200c1dc77ab66101c8c0f06405c635fabe181aae61bed1ff5. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/HKG732152371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f2c0343f7487df0a7899bf64b00987dfacd22930adcf834ac30c621ab62dc3. 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/FRX452255406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a412d0b303694f5ed3a838533f8aca3936bf8cd02130ad394bad7b4defa02b. 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/FRX452126397.