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 0xfa5464391770796940f60cd37ab01842e4d0d8a8e8db191f0690b6f21d82e79e. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6efac8c3-8f21-4d43-9cce-312e07c4c835.json and https://artists.proofprofile.net/proofs/artist/6efac8c3-8f21-4d43-9cce-312e07c4c835.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Arnold, Scheidt, Lutosławski, Berlin, Nagle & Koetsier: Berlin Brass Quintet
Quintet No. 1, Op. 73: I. Allegro vivace
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 0x2b23942aae8afc59ad5b3eba60ce4a54d33be59d6b848305a78ce8a0d9253524. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DEZ651700821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc852ac17f0c8a2bf86d3c031117da24aab1ae2fe94fee8493f386f67f005054a. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEZ651700822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00212b9d4781977efc5a6d65d60024780edbf702243ce79ef5e45b1381a3006. 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/DEZ651700823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e39d46b402d26e690eb838c2b10298667aa8e9eb5fc5985f42b16a2c697497. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/DEZ651700824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1fa208b3d71bbd6529ddda7c7b008c633831082af8b26274f73d6e7c3dd45c. 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/DEZ651700825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4f14741962d5d446b5b46672c5302c0e596988f023a26a22c083353eaaaf9b. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DEZ651700826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d2ec4c006966fbbf42db70d5d3dc850ae907a5b26bcdd8c651a2a14b568500. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEZ651700827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fcabfb2e00bc5039a540c76d06bad81863ca9078f243180af01512df5d38324. 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/DEZ651700828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95814754da8dbe04e6377d2d6677837b9b861b10d294e9030e4263a2ef56746d. 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/DEZ651700829.
Brass-Quintet, Op. 65: I. Andante – Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee6fc37015a3dfff555ae46d68887fa48ebeafed814cd154eafe138628e1f8f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEZ651700830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57d7b31ed854fb00dbe96e57ed3636778f2cd967e3a58ef0b26063ecbf695a2. 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/DEZ651700831.
Brass-Quintet, Op. 65: III. Molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c3d4281e48a57c72e36867d831e4ad92d674f5a55d7a2209d24bc1dda98c8e. 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/DEZ651700832.
Trombone Concertino in E-Flat Major, Op. 4: I. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e4c521cfa4d9843a1f40370e475ed05c4334677943e87df61320a278063cc6. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DES380005396.