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 0xa9f561d2f4bf9400b9f9242b2b92f82474ca757d33a54c7819ac22548ce881a4. 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/eaa07c04-5f41-4c19-b5f3-66eaa631316e.json and https://artists.proofprofile.net/proofs/artist/eaa07c04-5f41-4c19-b5f3-66eaa631316e.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 0x5fb7e39a74ec6f1b42491097c35aacc2fa4e8380ba2da8814ed6a7b38261ef14. 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/CH3131915480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d45eeaef927c634bbfcb3ec3b9014de9efa0fa3fa5cbd31075999895f21bab. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T08:17:35Z), 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/CH3131915482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc70eeb37ea1901a9da6b2312fd94225c805f8a54e5a94c161932ddc93b16abf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CH3132317696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2c984f81120f92b50c81f7afba8b04febee4c1a77fbb76b74567d0fe22aa8f. 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/CH3132317697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70bd38912ede5ddd762c36a7ee195e35ed4effba931ed93cb3a4660d6bced42b. 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/GBEWA2303801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad03d7f49e58d66b98a6a7dc6b826a73047ea9dd403e03f04cc4c6f897ce5170. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/GBEWA2303813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66df7ca34957be652a59d1bd88845ec4b726f71c36953e3eca1467ed9a53cbd6. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/GBKQU2340996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f2c7cf3e41ac4868d15c96e57043aab5cf3095d122f3df51a01006210ac5e9. 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/GBLV62415447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66df7ca34957be652a59d1bd88845ec4b726f71c36953e3eca1467ed9a53cbd6. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:20:00Z), 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/GBKQU2340996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0aed8efd9d8b8777eb4223824490c527ca63dc04b32764882b79583e73d7865. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/US38Y2535005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f725533ac524117748a57d1af70b307711a17f8cada6bee98791b66277546d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CH3132116341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ef283c7554aecec6dbb025cd0d4fbca2cedb622cbb05496062af2d8ad337de. 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/GBKQU2380357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb7f39de190bb11d28543c976fcdc482a63b72715b646eed0126664c0349c03. 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/DEW872301174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d10b8edea9a16332ec99c8d4ff4479d1f48d849ed3df59c84d834673b0455a4. 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/DEW872301175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2604735349bd622bd7611a7f26b0ed35355b09fee9608ab4a07239c29e473ae. 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/GBEWA2404312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06db6fb917d9b6500aa585199547bf8c919098b590f06ddea9dc973dea53c77e. 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/GBEWA2306772.