thumb|Naturally 7 at the Zelt-Musik-Festival 2018 in Freiburg, Germany Naturally 7 is an American music group with a distinct a cappella style they call "vocal play," which, according to group leader
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dfb4475ee475ff25316358578336f025cce674539a88472077ad1d6624ae9ed. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/11933319-6c51-44f6-9a02-30d0f9a0962a.json and https://artists.proofprofile.net/proofs/artist/11933319-6c51-44f6-9a02-30d0f9a0962a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Have I Told You Lately That I Love You (with Naturally 7)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164c4a6f2bf8698c46d645211a0487a903975e05b63b62485abce4697a56058a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USRE11300074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0b060ed40731c4400a3ac6c0232a0b969e8fb5b140c6fcb9ee0d08ceff4ab5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USRE11300291.
Christmas (Deluxe 10th Anniversary Edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b50c65531c55cb05bee893b67f4600462839f74f403e48d05f573c091198780. 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/USRE12100721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a7ce76cb794d74ab41e73f024f2c71bd7c8cbd495590016bf7a167eae16e42. 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/USRE10901479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a7ce76cb794d74ab41e73f024f2c71bd7c8cbd495590016bf7a167eae16e42. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USRE10901479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569d73a33b890d11fd4cbea544f44249310db10cc834999b479765ed4261d8e7. 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/DEUM72311387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164c4a6f2bf8698c46d645211a0487a903975e05b63b62485abce4697a56058a. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USRE11300074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9120207c72ae937ba415786922c3f3900368623c6e3c953f40f777e42adc7ab. 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/DELV41600804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a65c467d7ae793feebee804cf74352b07867ecd0a910b8b382281efba311f8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DELV41600808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000d10099ac774e4c44bf9ddefed59491aa4733a2d6018b706bb4bce16753e3e. 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/DELV41600810.
Jerusalem (feat. The Swingles) (with Chantage Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f8303055a3386742967029670a0ac5c38c90ab16049ddaa727a8d6db698b08. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DELV41600803.
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 0x06d7d76e4d8e91a1a345f3d4fa144d5a34dd79e5d9aedee162e9b0fa965b5a70. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DELV41600805.
Going Home "Largo From New World Symphony"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4b47dac06614b4409b8fa24b90d6efcbc5167279bb7c69d97ce4e79901f308. 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/DELV41600806.
Caught in the Moment (feat. Kevin "K O" Olusola)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf840119e1bd3850175be8cb5f6ca2b3739deb568d52261bb773d88262f1602f9. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DELV41600811.