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 0xd294d0147a70460ab85887b1f96d34ea9e330cebe0443caef4046ab78561044e. 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/7d6f7c86-2044-416b-a74b-e90f077ff3ee.json and https://artists.proofprofile.net/proofs/artist/7d6f7c86-2044-416b-a74b-e90f077ff3ee.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 0xbb699bb71f492d565173e56cf3349d75ccda669b51cc56c4bea4f77adeff8678. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/ES71G1950218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50351fcf87e4153f71d05257bf6e9e8f557165c5b83f9ac5a862e19c50c55d9. 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/ES71G2125777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5977d6aa405996f7d69f3655b9d83cfb4175799e57779712a24cbf1fe9d5e492. 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/ES71G2146052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfc2ffde8e165fb6ac43c4808fb00f2db74e566062034cec630c75751fcd0a0. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ES71G2206535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841cc90f706bb94aa6d0e0d9aae7adf316033942ef529b6b8df560070fa4cebd. 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/QZMZ92370242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33b4611a1fc4e21ac23cae8210ff8fabea2300a5801614c42068671b48bc416. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/US7VG2496275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a335f4aff5fbcb9a8dfb6f54e43637503014f63331bcf0ecba2dba91ff11662. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNJZ2448960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6cd404d789e499e355f568138815b81818b0a8edba3ac68cfd7d3da83b24a1. 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/QZW9K2418958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571d6500bbd21e3cb5da20c4543be0987144c0a6428b0739238155e83e0fc9fb. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZW9K2418959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcd4fc7bc40c5d5dc89ab2fb259383c29e446f3e31f2d5ba544e38f8d0439eb. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZW9K2418960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540dc6217b114061989026e5099c2ba029674199eb9c12f77462b7deb416d7bc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZW9K2409881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a386479b30e2326f54a48e81729790f3de1f3719c2303c57e4861b54e72210. 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/QZNJZ2551148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5232076bfd60e6161d23e3208fad3a93dc2062928ff68c14a6aef0849f5b60d0. 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/QM4TW2583973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b90c4c500eb5ae6894b054286da3c91d31b4f41bcb7af2333876103a0e1f3f. 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/QZWDD2445214.