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 0x0fdc44360133bee053c0f63760bbe1ee024e0069b66165e239ac08a69c4a4d64. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/75c7962a-0e92-4b6d-b11a-6d7dae6048fd.json and https://artists.proofprofile.net/proofs/artist/75c7962a-0e92-4b6d-b11a-6d7dae6048fd.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Carmen, Act I: Melodrama. Repos! ... Une jolie fille
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 0x8880210f378d85e258c223d89e9afa791eb8889f7a407cb800b44d3695bd3bf1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230731 — a six-check JSON result.
Carmen, Act I: Dialogue. Dites-moi, brigadier
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a9e3d635fe38f228a00aca2f9910a8886e419f6964fceef7ec3ab37e3bde8d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230733 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cedcd6c4718ac0fc3e178a7cb8db118c65a8231ad639f83170fa3ccbd4ee31d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230737 — a six-check JSON result.
Carmen, Act I: Monsieur le brigadier? – Duet. Parle-moi de ma mère!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49c20460b1a5cfa014724bf0b7e357b77a7e13350415a3e8b0308b41bcf641a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230738 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25f01962fa8c73da80e58fcf7a37f1aac8543e0789207bf52a5812043c8f1e0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230741 — a six-check JSON result.
Carmen, Act I: Dialogue. Ah! enfin! un peu de silence!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48dec8f588d1b6324cc60ecfdbd5e4c07d593ca5541cb5c58e1be0e001873c0a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230742 — a six-check JSON result.
Carmen, Act I: Avez-vous quelque chose à repondre? – Tra la la la
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d507ff272d85e755019398f77857bb2e7c291f541cef293b34c5569adb007ae. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230708 — a six-check JSON result.
Carmen, Act I: Dialogue. Vous êtes si jeune, seigneur officier
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf7a783605f0e3c74f5283e0d1c301f4d05bffbe74e902d0b01e9ba720927f4. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230743 — a six-check JSON result.
Carmen, Act I: Finale. Le lieutenant! Prenez garde!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0b6f9377e63d12907694ce99d083aeff4514551e2eeb23f6f6bd168fae459d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230744 — a six-check JSON result.
Carmen, Act II: Dialogue. Enfin ... Tu as mis le temps!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde0ecdce93fd2ae8076d6955d14fb45a6c358d15efad894c42483445a4c72e4e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230750 — a six-check JSON result.
Carmen, Act III: Dialogue. Carmen, ne me fuis pas...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bf6b8fce6d4a2b9a535bb865a59c990d091f825e0eec9e4ff21ead7a331ceb. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230754 — a six-check JSON result.
Carmen, Act III: Dialogue. Alerte! – Ensemble. Quant au douanier, c'est notre affaire!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357a3825e43edb9538f0bd455d2aecaff6909e048795506708b5005864fd54e0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230759 — a six-check JSON result.
Carmen, Act III: Dialogue. Mais... je ne me trompe pas...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98e66e1293d412eed8dfd7fb53a0701b63784492659b16844090433f409d366. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058230761 — a six-check JSON result.