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 0x9dcb41bf1db2c2c04a88e089628fee98b9fcb949b8a3ec62779489b8ebc6bcab. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b9a7b04b-fe2d-432c-b5b4-c431a2f65105.json and https://artists.proofprofile.net/proofs/artist/b9a7b04b-fe2d-432c-b5b4-c431a2f65105.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
When I Fall in Love (SMATB choir version)
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 0xa43ec1a8e849595b4b8b283a64d9dd83ed99b828a19b7f362292746604333bc2. 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/SEVPD1700104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638eb45bb930a29920b8f2a819316dbbbd204e1344116da9cf04dfcab6f70231. 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/SEVPD1700110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4896e5b91b3fde38dd9e5fb0117774814f7f012966b1c8a2210721f32162606a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SEVPD1700102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70c09fc3945b094d7b6d6618b3c5bd81c8f717f3df292e3d57ee4f1e46c82904. 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/SEVPD1700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9dbfe125d3a07b529e57adcf5522c2dccd833b1a783dc30f7ab0491a89c722. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SEVPD1700114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41176a90a390b35f0916d76235a776ac2dc44941c6e073b96a9fd96191c6b628. 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/SEVPD1700105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b542b3f6abe08b78c9620cea0226e43caa97e8d0cf1b3b04320303df6ee7ab. 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/SEVPD1700109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75fc2c5bf7a06490944837c9722c1e0e996ee220ecefd68640d3307e005786ab. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/CH6542387382.
Sa skimrande var aldrig havet (Never Did the Sea Shimmer Like This) (arr. A. Edenroth): Så skimrande var aldrig havet
Svenska visor och valser (Swedish songs and waltzes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57891bf02e8eb11f3eef8a9ca22e0edf905a62caf3e9e72d2240bdada244f858. 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/HKI199325514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d812bea4efe31bc48e98a5ceebda0d34a3788d560fd1eecc74ec6f30859a7e0. 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/CH6541622318.
4x4 Female Choir of Padagogische Hochschule Heidelberg
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8faa6082b511ae94fc4ee89833256b11c9414111a6eee221ab8b1a64d73d88e. 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/DECD11791008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa728b959f3eaf43a0a9d721a5f5589e685158f7911adc1b96f31376bcc42eeaf. 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/NOCOU1801090.