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 0xc8c96c1022a1774a98aded5b542cffac3f7a94f9ec6d582f5f627ccd44525534. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/61ea8d09-062a-4a14-95bb-2231619b37ca.json and https://artists.proofprofile.net/proofs/artist/61ea8d09-062a-4a14-95bb-2231619b37ca.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6f25a27c0874efca70b4282478519c9d8129fc3d45b0ecc0432ff18a212750. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DKANP5174111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bde791600369f095f02b219dc7ab2b7cd7a4d108424292c36a6fe8550819c4e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DKANP5174120.
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
Lieber Canticorum 2 - Music by Vagn Holmboe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c06c5b43d200e3c101360bf804d52967252c852abf25d79e77e28d12d9ca0d. 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/DKANP1270103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677ddd2a3866758120aca34a8b2ebbc231ad69b543ae68aef4c13e289ddf54b6. 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/DKANP1270105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x759781caf964ee9f72acce80439d3ab57b17d5b99065679f7c1ba31e984b8ead. 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/DKANP1270109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d0f91408511247a6e0a14f07bf23aca790b2f7ba96af0ca6f6f33231266648. 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/DKANP1270112.
Danish Choral Music from the 1900s - Græsset Grønnes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d9919d42c0d6e65eb7ade374aef5c98da390b007eecc14a413caa320e5fe7d. 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/DKANP0560101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1893b47ff33ad651a75a6aed27a1fe6dc98626c64d3d408ae235447d4c7a290. 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/DKANP0560102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8eab0caae0f7828d57fbf565cb67cec3796147479dc2425e3c39ec6b04d65b. 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/DKANP0560103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422789de8530f0cc145312a09a60f0c85fa2b483a1f775e2c87fe04147834edc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DKANP0560105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581b2eaf5d87d11abe8adbc360c9f6fbcf4cc986d50e7bfa2ef22ae49bd8a709. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DKANP0560107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecba423d0c50825eeb07f0382a653dd0736b8767065059573474defcd1df0e5f. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DKANP0560108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22cf03342997ab49ac4b17578513cf66eebe6c901cae6dc049321334054580c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DKANP0560109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3550bba5c246fa51256a2e19b90bad63ab741a7504ab6fbb299c832ca03f058. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DKANP0560112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44bcb0796a4f0e95c2ba0d0fe64813002f565ef4e79caecbb9e23b2915b7615. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DKANP0560104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b547f04e1324e3ed3f44d8ad543d23c6e445f02ca92a9159dfe32868ca108f8. 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/DKANP0560106.
Danmark Nu Blunder Den Lyse Nat - 25 Danske Sange
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab92b3a48feff6f7c7d2beafb97214261a1d8134ea535f40569d979f4c050d9. 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/DKANP9845104.
Romantic Choral Music - Dvorak - Rossini - Bruckner - Brahms - Reger
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffbe2859998abf92d3f1d38c267665ac47cc83cdd24bdad438d2e01f7727d719. 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/DKANR9105120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfabb7bae92ab571599705d216fa002b7f6dd386680735798819a064d9c563f1a. 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/DKANR9105126.
O Quam Dulcis - Choral Music from the Time of Christian IV
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43bdc87d25ca3767387bccfed01658d6a32a28f5471fb1511d1b93103ac291b5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DKANP8991113.
Springtime in Fünen; Suite from Aladdin; Three Motets, Op. 55