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 0x8b86c51f45e0ada67309ad73c65ca939b618577342acb066350e851e540d9e68. 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/2a82a34a-ae75-4b60-a968-7125c738970b.json and https://artists.proofprofile.net/proofs/artist/2a82a34a-ae75-4b60-a968-7125c738970b.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 0x25e52cb258801ba708a6076b336503d2a1fe3080981c111710571efdf8b60868. 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/FR99S0900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a73538d609f1a5f94b376b36f6fa96ffae79881701d5de12277ede6cc92cfcd. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FR99S0900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea28baa6e689a82f6fcfcdd43fa404a4bf25b23193c36d5ffcb6a7f84a5a53b9. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FR99S1200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3290a78b7b69d79a3e8ea445a8931bdf74a3ee3ede3af786a491d19a814559ee. 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/FR99S1200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15b7a09dc6bd4ced096683b886aafc028c8fc062201fe75cbd053da3e9af8ae. 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/FR99S1200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4622b6f850fb7ac7c5d67cf3f2b56c84ed5bc02b95c60dd731c1695764d1cd3. 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/FR99S1300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c53ce6bac3ea5fb86a79db259054d5ecf34e296968dd5907665d66f0b326443. 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/FR99S1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf50de5315214d60f7c1e0c9cefe94b45df1ede95a7b4653e41810e59b3913e3. 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/FR99S1300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b72a04f63d3c2e8e937812f566aea1f3e51ad5314b6c812a5d9a0dd1f8b175d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FR99S1300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d65dcd4f117ed15de55ee3bb41aa4b3ffdfb72ad0fac88c4e9c5307107d9572. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/FR99S1200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc52a4b311b2265bb1d175e7a47ade25d893ec66563d054d4ad54f0db6dcda1a. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/FR99S1300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a0cb3cd9848d36c5a649b8609e6ee8a95f51527e8d60cab290105c87dbabe5. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/FR99S1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393d1e0b3ee66181bebf7441e40d2770eced050022af3cb0b9f7b1adda6f3525. 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/FR99S1300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00fa4c708ca9e06e49cbc09e274c24ca4b0f5914be9639d0812177ec4ab9d2cd. 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/FR99S1300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ae7667648c1894e82c300ba6543c78176620e26d389db6e8d1444670d42213. 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/FR99S1300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8838c9eaf7a871ce0edb2d6389aa4f6ae170a2a3108d5c1de4abf8f14c256233. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FR99S1300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8070015d1e8a9462c0931ebafd791462bd5bb128bc5f266bfbfb206c253aa13d. 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/FR9W11806808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9e5b7a8148ea091beecb5f58e7d44cc3a7bfdbd442d2230454141a5529c79c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FR9NF2200050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91ca1b79ce8d1654aa05681cf3469de140b72807e45107ddba03410959bb5fa. 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/FR9NF2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9666936b4dcc86da91848667b55116d79e3aa1bbc40f9f023540720ff002250f. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/FRY432100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf66e72f2997875d3911b6b745f1ad78d4caf6ca1f1676219d8b1fe55e28a4b34. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FRY432100050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dfe2c5f0bd956855b40e9ebeac1b2846a32b0f65ea9918667e0921e08241346. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FRPGB1909140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94bac466d187cbfbbaa5a37e3431653fdbcb00601e09e2c6f2bbff9c2d743cc. 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/FRPGB1909250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9f1f41cb5e63a51b79bed5b5b303996435262ca6369165bcbd1eb09d44d6c0. 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/FR99S0900013.