thumb|right|270px|A colorful selection of crayons A crayon (or wax pastel) is a stick of pigmented wax used for writing or drawing. Wax crayons differ from pastels, in which the pigment is mixed with
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 0xe6c5115c626cabc3e37e33a977a80fb7f799bedda8abf5f58a0e8a1f47e48010. 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/07cf5615-93fb-4129-8395-9179c7597b21.json and https://artists.proofprofile.net/proofs/artist/07cf5615-93fb-4129-8395-9179c7597b21.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 0x41ff62937ca06265c65f11a13142bb3693ace659b76f1e922cb078e32b1cff99. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FR9W11609305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde8806c8cc29aaca70c751409681fa12e0ed31b7357244bde8733ec916d0656. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/FRX201768766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12dbe94538d4dee4672eaefdcca37fdddc05bf2c75b96c99e87528b12740a02b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRX281712981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf965c2a20bab5b856ec4eeb680cdca079978e998df451d00345c454967425eb6. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/FRX281712982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e8f1ea63074c345361c65774072f984440a12bbaad96ff25bfe85a8d525754. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/GBWZD2115101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c88d6fd8e7bdd311e81d92b1f7cd666698fd8d6566fcc2ab24a6e2f280845e. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/GBWZD2215102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8574f3c46f9ce8c7c258aacb661a1b607d9a08d9bad41f18cc3b1373d0745918. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR7X62400130.
Kitsuné Soleil Mix 2 by Gildas Kitsuné & Jerry Bouthier
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0fe734b51ba089b9d039ca41f0021648e1eac79958f69065b10a040cd535af. 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/FRU701300068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bbcb7d0fec7eab123bca51bf4e9a35cd92facc6964ae8d4fd3876d27bb5f56. 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/FR9W12209500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c33b017ee5f2084881b923885749122a7f4eae87a5d3df9bfc06bdf8462596. 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/FR96X1651236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf473a37c428f9aa3801954b9ab42a2c7736e10248069b033ffaedfcd3d5666d. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/FR9W12204553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2b96f037af20824b904e58bc780cc7220c15801066a5f0611984349a821a3d. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/FR9W12209494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bbcb7d0fec7eab123bca51bf4e9a35cd92facc6964ae8d4fd3876d27bb5f56. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/FR9W12209500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2b96f037af20824b904e58bc780cc7220c15801066a5f0611984349a821a3d. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/FR9W12209494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf473a37c428f9aa3801954b9ab42a2c7736e10248069b033ffaedfcd3d5666d. 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/FR9W12204553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a203052079cea20c7abe8ba2467bbf3269507a17cb99ef2bf2be9253fae5ce. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/FRU701300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x185f2f09c1f14c451d9c4d0a6f48bbae94fda05cb56717e65e2e970a314545fc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR9W11507241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1553d335094ea7bf7e8344ecaaefc7a91d2d00abf8465dab6d71a46bb89a918. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR9W11507245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7bdce9207e9ae15d335186827137f42d1129e73a591c15d74898bbc2365aed. 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/FR10S1812739.