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 0x1cc709fe709266840fb420e321391a32f8aba4c8b0476947b7de8827a2de6fbe. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f0031953-caca-4309-8aed-40189cbe6cdf.json and https://artists.proofprofile.net/proofs/artist/f0031953-caca-4309-8aed-40189cbe6cdf.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 0x53cb67c0030817b0b82cee3e9d9c8cc04403605005ce5cb0c8e3663e5c4c353d. 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/TWA532101173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2968a663cd11ab40e7746cba5797bf08852dd3430e694edac8bbb8dfed00ab60. 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/TWA532101175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7914ddb719ec10a866365b840a9bf74be0c5776c9abbcf77eed43c8d6b8f08fa. 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/TWA532101176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd999664b5fe3d4f9cd5b1b69e68f7e5fd9221ff02c3127a6b7879ab0adbcf1e. 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/TWA532101859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa897b589331accfa7e328cfbc56090c3208c8a2217011ef41220bcb7482966. 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/TWA532101868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80c5b2dc00b45051b047e0c9ce26e878d9d98e25b88f40dae68a926a1adc3f2c. 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/TWA532101219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28c729052d632fec31dbfdceaeaa23b9958343c9442d334e3bc8d06553818c0. 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/TWA532101227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e58120d81929884ff6f25539e6a28155c58833f51758ad9987f46dcf8ea9bc. 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/TWA532101228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf5ae44533bf1ac495a09d72d56ec993175041e5d006fd99e085168cf3abe47. 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/TWA532101229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15433927741c9b1b2b13485415b3c89856bdb789296827b69a71b62e286c6ac0. 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/TWA532101230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b97ec9a8f29031cfb6df77da0ab39683e7f3b83c5e5b43f287900bbe289f7b9. 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/TWA532101233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf40f02eaea446e2e1829ee438e42e5f497c6bf8813c6579694298a55f8f27c15. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TWP012120411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a488dd77801d5f1f3c114fd470697978eeb6583f0edc9cffc3f90d0616eda5. 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/TWA532101380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd407f10b1dfe23e75ec9a059df323a81d0150f88423e397c66e5b1e6919c0cdf. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TWA532101381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596a777ee1c2cb2296d48cb03c7832cd30f94f87029d02b69b312981066ff6fe. 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/TWA532101290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac35cc47c21980f44cc9a5437b49c1c60c0041def4b824bfe7f47fb8a739444. 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/TWA532101298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc813333a095ed6cbcfa6f9d0afc1f42d2e6c7b8c2127b7e15586fd9b88a095. 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/TWA532101299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccc2ac7cc65fe73729a17dbdd82da98432ddb49caabb66e74e733ed92f489a4. 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/TWA532101303.