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 0x7240d9d5a0333aeb678cab631cae56d27e5a96c7dc24340e5f821eb97c02ab21. 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/d69c5f14-6445-49ef-b460-c52e730f55d1.json and https://artists.proofprofile.net/proofs/artist/d69c5f14-6445-49ef-b460-c52e730f55d1.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 0x6243740b99d2821302c5511432582846293995d30a1490aed44b5331b5f899c1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USA2P2117836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d33e1495f26120eee819f17a2350fb9893ecef5ad312ccf518e64ab04800352. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/CA5KR0003561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be6a0744e8a1a6c81a76d0c098a13e44562174989a5ac44a6b4b15c4a4fafb3. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZKDK2292276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73d485d6ffd9edd7b6df749399b6ed9315db15795bf7e28272d2155ce4ac930. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/CA5KR2411471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922d00d3675649f7146747cdb9a4ce2991e08e1e06ed15eb892b1a93246e0e4d. 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/CA5KR2445768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a39e4a593a48f29380885287d4eaa1457e4383ef3a436db225c5305cb96711. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR2445769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x990cf2987e105780e07cb4e4700147c2363dd543d28f790a5e073c78336844eb. 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/CA5KR2445771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34914c5a5cd6f14a5cb1bb27a43723b211bb58c47c5c1e7cc8b739c4198cddaf. 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/QZMHP2596586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4e2674c98c28f969bb41f0ff501bb7140ebb8331a085108e4274c200e076a5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USDM32029701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46c4c23f29c150d2188114c8e60eab387abfc84f5f02eb8f94e92456ed89afd. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CA5KR2445766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361b5cec12c4f6d87a559911ad3ffe75c2268085d93b1a67a94ed5096b734e28. 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/QM42K1977351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c1646b9811888a7d76d1507d8d2e2ca05ed5352ea1b7b5ee2f14b5498d1c0c. 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/USA2P2025096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f30d13cb03d5dbeec0400ef53d2904fb6bd4e9915309270c819d71e919112d0. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USZ4V1600258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1811fe820d818a2e7af6bf5295667e3823efd7314209c0aa40ddfe5c18be2d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CAUM81700153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f0205c12b2c68c7b714dfb320b0a77c62ffbafdb4b6e4b9b4d294d0d0e31f69. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR0012729.