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 0x33ae9964a6c1bbab99ce7df3ad68d7528b3957b0c256b2546e80296e50027798. 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/488a1469-e801-4504-b986-26dcda2221ed.json and https://artists.proofprofile.net/proofs/artist/488a1469-e801-4504-b986-26dcda2221ed.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 0x4dad201986e5ed7fb5a29af9ca2cb567d3861ec755afcf38dcd6760fb2f7975f. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/CH3771200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d38778f0844c09621696cfaa504d640af8158d78fb9496f900627901e64b0c0. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/CH3771200009.
En public, Vol. 1 (Scène Ella Fitzgerald, Live 2013)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63f63d2c78a0e4394968291c531a6e61c7952eb7f2788a22ce8402d07e58715. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/FRZ041600072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997d101838fa3e9b3841493864112ba7ea161062227501bdc00706850c6c8048. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/FRZ041700661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a65cb7ad93b4caab4d061bc1afd765362bcd866a3d67c6ddd62b1af29a654be. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/FRZ041600073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c80d5969f1cf653460a5b6be73835a2c2853bba8cbf4d2d0ca976e262f27300. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/FRZ041700662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6284ee9cbe8ccd7cc7918679d25b2255243eeb4e86eb85878c97c55365a677. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FRZ041600954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca36c1f9d1bb2b2d42c12294864206f30a0b81bde4df4f911aa1bb8ed5b7d1e7. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/CHE252000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe9a194e0f7af16e5edfccef392f11306fa5219926764f52898812c9c28e83a. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/CHE252200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106d1a495deee4fcf1d80145b54b917c9a8ce66baba737a8bb6338724809f765. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CHE252200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca36c1f9d1bb2b2d42c12294864206f30a0b81bde4df4f911aa1bb8ed5b7d1e7. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/CHE252000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaefe03f458802cdd37da4f068d5c305c8c9952aa1e0da615200827571cecad8d. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/CHE252200005.
Droit devant (Exposition "Ici, le lac ressemble à la mer" - Musée du Léman)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e60d6ec2242ff87c1da8149dba6d2fc6ea6351ba6a1b662af247f36aeec3ee. 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/CH4061901707.
L'école des fables...part en classe verte!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f183f40cdc5a7b7b0a5b1e13f56f6dfe512cef0c0f24244192fc832a64df35b. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/FR9W12308269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e60d6ec2242ff87c1da8149dba6d2fc6ea6351ba6a1b662af247f36aeec3ee. 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/CH4061901707.