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 0xaf2b3de8a460350adb9cf721322b3fd857ad937368af7e09f58080ce852017e5. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/42d620f4-10cc-4afb-b47b-4f2669efaa09.json and https://artists.proofprofile.net/proofs/artist/42d620f4-10cc-4afb-b47b-4f2669efaa09.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
L'Don & Compagnie hors-série : Repas de famille
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 0xc847059eeaa7281a75f857ad772ce0b14ce73d06dc30f742fed26deb564eb3e4. 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/QZWFN2318890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f750a136bd0c867b020d68351803079bfd736ab488c54eed3112cf29d01c84b. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZWFN2318891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904f56a0778bb75443c2eba1c3c93c4b4ab601e4713b3c74d277998e6b691899. 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/QZWFN2318895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9017ba31df2e06cc753103182e5d51650d6666c496b12c965f8f0c4962fb357. 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/QZWFN2318897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46aa8bed869358b34c05878e635c9391d3b27ae59a2c2931b7c6056ab3b76407. 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/QZHN82369744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8552c0cae49196edfe6b1dbaa8b19cb9a6d03a5a9f862e75a98bd5c4130f52bb. 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/QZHN82369745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f44b1ba1f45f3d6f7c32f843547510ce2a322df7a8a5f4a2c4d32da9f4b8bc0. 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/QZHN82369746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d73803d84c95a91f914abe54e55f59ab47e5070bee3975da7017a76c7ff044. 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/QZHN82369747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd02cc69ab0345b9b210c0c17fd401a33f5469540afe9c9c5958adbf846f5e3. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZHN82369748.
L'Don & Compagnie vol.5 : Starring Worms-T
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2eb7e2952344abd560b6ef4e76019edf0bf3daa7b5726e5c1a8a8571fab3d42. 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/QZWFG2357706.
L'Don & Compagnie vol.4 : Starring Famille Nombreuse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a4d753d70e737345a885256547a0b805384e6791e753a2c2b99bdc142dd4d2. 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/QZTBB2361204.
L'Don & Compagnie vol.3 : Starring Râmiro
L'Don & Compagnie vol.2 : Starring PAPI TeddyBear & GAL
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292c03d9f045b36a133a860f798d8d0f772f926f4a8c0e7297d2de0ff001a9e1. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZPLR2330619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135fe4b601b39fd891b174617821096d383b0aff83796b241ab2bc5206267efc. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZMEP2361336.
L'Don & Compagnie vol.1 : Starring Monsieur Dioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb08226ce5aba349288452a00ecf7a23e7cccf72a570cdfa212827e2aaf04932. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZHN62392232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52438eaeaf17ad9a420a3eebd8f784255845d9e3eb9dc6f58df4590424db72fc. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZDA62385080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0bba700d3cc2fa13f1fa0951326f04044f384e0a980599ad189f745642c384. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTB32221772.