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 0x217cfa0146df0b96f563cfd804f54be8c7489be74c57bdef52f68aef7f9bd7c3. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4fff7cd3-4139-434b-bd82-5078d5e9d451.json and https://artists.proofprofile.net/proofs/artist/4fff7cd3-4139-434b-bd82-5078d5e9d451.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 0xc0212b0bebf31b385309b828b1f0d9d5b123992c78d244a979933ddc0ef6ef29. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USA560652381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39847fec5cc90994227138bd2f01b8e85e63ebc0181f7e7035511479b60744f7. 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/USA560720741.
The Waking: Choral Music of Terry Schlenker
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df98dd57f6394350c346e6534589504f95b7d47448eb9aa7ccf7f660ffd715b. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/USA371018259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80d50206faa60324fe44a851d8117609131051cc053b315cc2f34afc7bfb51b. 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/USA371018260.
Nunc Dimittis, From Evening Service In A
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3783ead604d6094f81ef5f0c1271cca8bb6caa1d2e4eea291786b8cb9a307528. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USA371018261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ab9667a80ade48ba1ca4c344f04ccb349b68e13deb065ef13c48ce045911be. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USA371018262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9596bd09f40bda2d08e3086a4dd665b2739e91c5d6b6567f9522254da35fb26e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USA371018263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd512cabc7dce19870e21bc162407f0d52b4f0df79c29987a78414d36fa65de. 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/USA371018264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8389910f8cf0bfb4849674f36fd25434ac15b408614f3f963715dfbbde48af. 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/USA371018266.
Ein' Feste Burg, From Ein' Feste Burg Ist Unser Gott
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed6c642810301066382052089de9242e2046c0abfada7e0d4df24ab7bfeb505. 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/USA371018268.
Mit Unsrer Macht, From Ein' Feste Burg Ist Unser Gott
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45acae7b3a558debbf44762480bdd42c40fae283195132ade012102e6acb7e2a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USA371018269.
Das Wort, From Ein' Feste Burg Ist Unser Gott
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999321fde761a0dcea5f7011a62cb6adb56c0d7d4d6d677e8e1261b4e6ab03d1. 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/USA371018271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f6cdd35347435216eed4bff51d42f1aad311479557f2b48f7dafe8b1176729. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USA371018274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe46cf85952ffed5647403ce3f162bba45a8d987dc68adfaf8fb3f4fbfda937d7. 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/USA371018275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4309b8aaa1868daf9381dd533a4fdd782b3d50491402200b8466856fcf3556d7. 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/USA371018276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ba9c285e9c4b6faaa2ec3589ccc16faf398b3d351a45ac166487a2af42d721. 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/USA371018277.