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 0xf84b534055c1e237c5c4feb2e81c3fbf514ff74596111350704950d265df5a33. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/18b1cba5-a294-4303-acf6-6e274101f2b8.json and https://artists.proofprofile.net/proofs/artist/18b1cba5-a294-4303-acf6-6e274101f2b8.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 0x74dd0a6c6fd753dc60ee68ae5298d5905013d5f344d411cc1b946f46447416e1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEQ322400310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71cba0a9725e8dd983a5d5326e27fffdb8bcdda9ca15f3da5504a2d09fac8ef. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEUM72408169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ebea1dd1a15f90117e1ea35e7015029430e4b8bd782fd4ccf48be003bd545f8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEUM72305492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc674fcaf4ef9a8ef84ab3052c49a9f570bb3217334b820a5dba58c4c21be9689. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEUM72300386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2798aa004a76bd9ec6c584b230c29115d47661ff9e44babff85e48ad7280289c. 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/DEUM72005812.
wintergefühle 2024 by The Circle Sessions
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10cd1944cc008b6f093c8950681cd9a5d35320ee41d97b7da4117c25f9b06a37. 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/DEUM72305495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014c3b60f7f5c8fcbe1a2d8396a01f4a483aa961dd7691318f52a07aab08ac87. 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/DEUM72000052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83eadb735514570c8c68999d1a41bc459481125f2e6ec62b5a64d09dd5395f5. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEUM72119796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f7f45aa47b0d7c26cc2047dcd03521a90e98bcca3e4b37477c5b2d35a4df9e. 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/DEUM71906780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42ddd4ba3418fd30be0c8aa2bcfa64569e176391648f856099cf9f0ee373ee2. 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/DEUM72305490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ca6f9cbed6f6c7c5d355f8f000a9b9759ec4c4412a55ff653cb9d49077bc42. 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/DEUM72305172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc674fcaf4ef9a8ef84ab3052c49a9f570bb3217334b820a5dba58c4c21be9689. 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/DEUM72300386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42ddd4ba3418fd30be0c8aa2bcfa64569e176391648f856099cf9f0ee373ee2. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/DEUM72305490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10cd1944cc008b6f093c8950681cd9a5d35320ee41d97b7da4117c25f9b06a37. 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/DEUM72305495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bdbda87345221fb044fbdeb91a439f6b6a2c91e10028f9fcc963f850555c163. 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/DEUM72305497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa2fed420a09b39ed1d3bc38cfebe79684e6faa4288a30dfdb4c24a100cfd89. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBLAZ2402131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbf1a9ce540e7d9a7aba089eecbb7e594df61f414d39541bd3cd69236a7c7c9. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEUM72305496.