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 0xa5af0bc70e836bd9e5ac51710d4d6d9994956fe5b5c2c7d70bc013902c76ca21. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad037d1f-3d06-4643-b10a-56ee4d98814b.json and https://artists.proofprofile.net/proofs/artist/ad037d1f-3d06-4643-b10a-56ee4d98814b.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 0x9a86d197613b6c3d25da5aeeac01d77a23119a2adbf5edd821686c37f88f1b0c. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/BCP0E2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7117ec2cd7e233c7335a07feed9fb75010cb65f19686898f356641efcf1c2693. 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/BCCZC2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b12f7d8cf71960bff36ffa827d46a6078137849c8256d36d12fc6282b0a7806. 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/BXTS72500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31cc330e7cec54382cc30878fdf31ff1d6268e9776bf0335177bcc6036add72c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BXTS72400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b26a37dcabf4b41603793cc5ebb2ccaa0e0c8be9a71626990f2dec7915f9f37. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BXTS72400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9699796bb64b1468d0edf33b3ea7275c0f16f94ae331a3a7c6dd8118f658c0. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/BXTS72500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcddcdf6ff5772d6f650b631e441342ac514e6be659dd2434e1bb460c89ab7de9. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/BXTS72500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118d2ec6bd14e019c9220292c1464bc9e41cddc0a90598dbbffa308781650bb9. 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/BXTS72500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7316ef3e9669b5944e37c7833250c4a7ef2fb8f489bc4b71a5318cf989c8965. 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/BXTS72500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc483bf73a1aef84ea23556908115eb6ae83775f1d370037f1765a9317293f9ec. 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/BXTS72500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9789c04838ef503d83294206886f176d2cd2871d06eafc94c7dd6346ae1d2a23. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/BXTS72500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872b1a54b150c89065713da0012c0d0b319b77819d7b3fb3678016ce5c654d0c. 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/BXTS72500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5811937f34b93fe6692c6001ceb2664df9db895afb07a405294a3efe1030d90a. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/BXTS72500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d1d1ad60565c2d5962c1753f52e9d89349f6d1532ce2ef1f4c06d4cf557276. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BXTS72100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1abf2a4d0caee393d8118f3829638aecbd9ad20f912143affafdb3c293988527. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/BXTS72500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118d2ec6bd14e019c9220292c1464bc9e41cddc0a90598dbbffa308781650bb9. 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/BXTS72500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b26a37dcabf4b41603793cc5ebb2ccaa0e0c8be9a71626990f2dec7915f9f37. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/BXTS72400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd215820fec87e2df9c80dab586498555815b72ab36d22b520dd787cc4ea3aa7c. 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/BCCZC2300007.