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 0xce336227addb24220ac5b4025d369ac7c97c56800254772676b834233a6c490c. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0c2a377b-0678-48c6-af96-5f2b266c1509.json and https://artists.proofprofile.net/proofs/artist/0c2a377b-0678-48c6-af96-5f2b266c1509.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
O crux. Chormusik zur Passions- und Osterzeit aus fünf Jahrhunderten. Five centuries of choral music for Holy Week and Eastertide
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 0xddc8d62928954575238174b0f86772632e8feebe72851fa0e06f14a619a1b790. 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/ATH071418910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ea2fb48cf416e74fb94f383287f46ac3b8293d350d1089be740e37007c951d. 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/ATH071418904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89e8e9b07a42e1492264fbac61bf6a63693ef75d11fda3bae4959e28d569685. 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/ATH071418902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e14664f4af8b22324f1fe27b3417a479d3bfc347a8be9f092b6c8921e661e63. 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/ATH071418906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10ca3ee9cd2c445369034480a537fc997c23f48f130519478a1a0f2b9f2a98d. 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/ATH071418908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6695200382a15e8de715acb3f030f0246114629d913c5dd796c78c456917fe5. 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/ATH071418912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597091818115c126b80c6884ec55a3796b6e0db813c023e5e8d3017c717d8d0a. 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/ATH071418913.
Der Mensch lebt und bestehet nur eine kleine Zeit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad2d71d83e3bfaac933a41aae8a5ce24d2e81981940fb3c0298bc52e4cb8a8ca. 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/ATH071418911.
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 0x5411c9ed29bd2168665eb01a892ede6a02239b0be3c7f60891156bcadc123a6c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ATH071418909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866dde93eacc53a1bd9260ae5c2222f2e09dbc434cec490213fc7784671089ca. 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/ATH071418901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b795c34286798273255d6547e3e2b8fe3715ae7c52d564087f29138fa6680d8. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ATH071418903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc790e0033508872413de0e60234d83a61d3a985c135dbf37ec3b413389a0013. 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/ATH071418905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286b999c84eaa3011f1dfc4da29719305cf7c13fe386bdaa5f6f16572d112ad7. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/ATH071418914.