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 0x95c9fed24c9c019435692344f197098494f9c53658bafe1a42cde425175c3e50. 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/38e93d09-4f1b-47ca-bee2-7babc79ef461.json and https://artists.proofprofile.net/proofs/artist/38e93d09-4f1b-47ca-bee2-7babc79ef461.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 0x85a18b4243e48b968fd38ae2e11beba9713c5a07ae83bd233ad15a04283f2dbc. 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/CHUM70602164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c15fc7105d1a3a30918e3e91f4cc10c3407fdeac528c5856d048a47dda592fa. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CHUM70602165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15cf87c0827a34da4e8f32c38ae2c86637f912f9ff3834c85477c2fc4cf02f9d. 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/CHUM70602166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf2ea5293ef8c21b596f3bee753df25d4bd406719ead1bc6961d4d73f53ff63. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CHUM70602167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f6828620c53305b8f439ef2e11ef6ddb0ad091492a7e1ddae51accc1ce4545. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CHUM70602168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa08a580ba5e9f935c6124b641aac3d7acc323277c19065efa9666d22a6fdefe. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/CHUM71400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeac46240dc07ec9170abd233a029267fdba8e785b8dcd3b786ed8ada5931d85. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CHUM71400072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9333996cee8576099504f14f8f17be87374aba018f387ff9a30b6b35fc4f1d56. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/CHUM71400374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90d91f2d4a85da2a87fb4c392c0e53d580e801c2e5ce335ff11db12893ee943. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CHUM71400375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0709613333f98281bbb9d50f052e5453ff107b4f98092b4af7a9bc7e897f8a66. 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/CHUM71500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a867cfa8d2f3bdf9d4491d7bc842ac72c71863423bcc92c3d1a989e8a3b28b. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/CHUM71500041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad60186eaffffad125a27d737b5a807e21b012f8494c5438166a6972eeab72e. 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/CHUM71500042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1006c5b3c2760e2f93db06403984687768819fb9e7489a86965dcad87bbaa76. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/CHUM71500043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a441c0fdccaeb8fca42a3804c076bcb59903cb61cfe1eda4c8e052c8c601aa3. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/CHUM71500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb3c2b8072e4d7f965a7a9aff9fcea847e6cfa8952d52792833977a7632c2c8. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CHUM71500051.