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 0xb251e3d0fe41298b29150b0b2e3be5047e7a03d7449d2c8d03d2c032d9c4c8b4. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7045499e-8cd9-45d7-881c-f1da8b5b8b31.json and https://artists.proofprofile.net/proofs/artist/7045499e-8cd9-45d7-881c-f1da8b5b8b31.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 0x5997bb111559e75d84cb9fcb09795948cca003339fc528a5afa0ebad6f01cb5f. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/NLE421902402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5900ad2afb1c4fd813362bf13a30f473fb623e7d5c89efe3a93b64fa4e629e0b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NLE421902403.
Il Tabarro, SC 85: Ballo con la padrona!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96148a7d80b4d1888a77832be43f96f46ea78bde731b1e1a8d01d10bb83801d8. 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/NLE421902404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ac158ed8df530affd45081415fdfeb4f98f0c081caf0bea537c4cea6ecdf1b. 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/NLE421902405.
Il Tabarro, SC 85: Conta ad ore le giornate
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd56ea42346dfa68622aaffd106f1eb93843f8e9b34e3dd6641e2612ce08f92. 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/NLE421902406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x315aa136c62915578ce398306e76bc0b8ece80dc88d34f4e23f9c35015b16e30. 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/NLE421902409.
Il Tabarro, SC 85: Belleville è il suolo e il nostro mondo!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd87d7e4ee22119c4868ba2538ab126a639a4dc0612aa6bd9689ab5bd75bcc8. 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/NLE421902410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf57286858c97ec2906a682b8bb6fd4f320219cca2f221d8f3dfcd67b0990af2e. 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/NLE421902412.
Il Tabarro, SC 85: Come? Non sei andato?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1019e9acb79832e846ef0698621a4840bcb27cca79a74f34d3164d74045edf7. 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/NLE421902413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a64b58ec77844269f9d48648a10ad09986f898eb14f4f355d14a9ff5fcb158. 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/NLE421902414.
Il Tabarro, SC 85: Perché non vai a letto?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e33f3bbf0b026fddd79332b7b18f3d6e6568d3777c0b0ad93584f3e14728374. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLE421902415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e953cba8dba762824382090c078255b8d679699a6809d236b8c2fc8d16d24e. 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/NLE421902419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2b62b0267d98fb067d0af71f754b91e1f5a546882de20c171bbf458050787c. 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/NLE421902420.