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 0xd8276b1c74f842ac82e3dca30667ca6ceea4d24f594de1a7aee6a3744e92649a. 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/f30f087b-45fc-4686-90cc-1832b7c06ac9.json and https://artists.proofprofile.net/proofs/artist/f30f087b-45fc-4686-90cc-1832b7c06ac9.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 0x7144146d9cd16e111d629bcf83682ee5984ad74f285371adac0e58bb44ce2d40. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/FR96X1849226.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23e5f45251fb13bde58f71d1046dc0108060a6a6d58d2ef6f30b3e57ff01400. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEK1934588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677744e5ad9d62d5ecd7038975d683f5ca6836a08a3695a0aaba111fd2e9927d. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/FR96X2144177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73026f2eeac70480887b07b2146d9e17acffeca86a712bc072ae7780ba0f040a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/FRX282101545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2148522bce49ec1b81bbd4f2ab3cf15972636e626b835ceb9aafabadb530612c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAFY2168007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb202a21f4cb3725f089d04843258bfcec0b23cb19da2848e7ed6c599915a0129. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAGF2222933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e358a4c59729a835fd8c5dfe9a5273147a6c8094879d0e5c3de049c6461fae2. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/TCAGM2218203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf100054ef0172c32b58f59771891b9f2f01fdb4375a585464e5240ee12012a. 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/TCAGM2218207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca07da219782a611998bf0cd53c41ddef94021732e312404d8c2bdfbb39234b. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/DGA062306918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e82a8db05c457b46938e9a06e61c230bafc9ba2713837c30b7267a018ebba06. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/DGA072383907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e356baa31e565ff7df1956efd1a4827d7f48572d30e164354b744ac642151c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAHT2334582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7d5e205a942e45a5f9f29b955381a74aefd206a4cb02d94309957e50c60ac5. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/TCAIJ2404352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5046a505846bc64cd598f95ec7248f6a85dfc6156599871c7d353ebc6183e6f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAIT2496063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b3c20ea7790b3a207b513dbfb0a731e1c45bcd13d17741b3595abea97768ade. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAJE2507408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a7364cfc75f9df7f72a054a5450a5269e08ace08d9527d6432418a2ce41be9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAJI2564169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc8597bfeebcd1709e9c3adda7275fbb79ed800719eb5568ea98165565fbf5b. 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/TCAJX2510991.