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 0x9fbe8a8fbdd3ed2bd2292e224aa8f69f226ddb40f40b3bed6d4f76562f1a419e. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec69e9d5-b3d8-45a7-ba37-46bde0bc84f2.json and https://artists.proofprofile.net/proofs/artist/ec69e9d5-b3d8-45a7-ba37-46bde0bc84f2.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 0x9b69862dab8fcba140e6a9625b790d6c8569484792ec6a2d047e2bb10420e1c5. 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/CH6542111284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96634d4643816bf3a410aa873b291062aab3ed395aac1120055389eb80a2863. 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/QZES62283621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd4d38f000e58cb1c1992696e29460e41118cbf3b0819932533a2224c99218d. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZES62283622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe660337113b8f9edc925f1db0b72782897e28c4fa630e03def0e45c395b034b4. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZES62283623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c07dcf42138179fff737b8f6d9edd810b06e89c7aaa255f3f163164deca5cc. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZES62283624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c49370b2125d149faa16a356874fdcbd1c63a8e99dd29643c8d53fc2355115b. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZES62283625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc1b3b2e7bdd23c78d7a0433ab0318ba6689338aa19814f7863388130da54ab. 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/QZWFM2374602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517c1b44b82297ee7a4f3f94e8aaef2e43d267d0cba7a25ae0e78c78debe549e. 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/QZK6F2448422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2fb7a051a16b9504cf92db47fae97eb6781db8cb4113956a23df785eb07564c. 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/QT3EX2425725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625fa218d5f7111d8ea3dd7b80c4b6e802bde4b24e81e8e4ae862a82c1b19a1f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZDA62536669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7efa7fae948bc845bc46c5dc9a3e7cf519926e6cd39041b2458c62fbe3b16a. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZES52578573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f36b80d428efea46eb901a745af3551be577a56823b45598bee61754eafabd. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZHN92539738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1098e753189f82b77bcdcdb4270d9496212303a236c43699c36e448785bffbf9. 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/QZK6M2560934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3eeee039db990dc36b4009db5f946cbe3b2be3eb9466db40d0a1d78e11e3b4f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZRP42599517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6397387f031c71db9be19ec39005c772a2b845672368f56a2a338aa5daa40315. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZTBB2542284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f3e1fb59e1dbc84e5067e32ff9115c5caaf3cad34e948bb565640b564338ed. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES11D2200793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de64e1498614409c77bd10cda66d8d5b721e8ff9fb8317f25d3013a38529660. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USDY41964374.