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 0xd4289f5f9ee3745d141c8b822db2afc9e705ff301d68c64d07ebd87c1e914e90. 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/ba989c24-c28b-4b2b-9589-0300cd0348d8.json and https://artists.proofprofile.net/proofs/artist/ba989c24-c28b-4b2b-9589-0300cd0348d8.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 0xad0c330969a00a3740ae702613f3b138da92a3e893e816e708a36a0699cf0fac. 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/HKD012387333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7bb0f0a038c8a6ff4f76d688a10cb75beb44854151668da20798374c5f01601. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/HKD012388878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f20bb33ae9554534f509d2ffbf8275e92ceef0c8b4100462ea4a7ac2637b81. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/HKD012388132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656d638cd4f8f3354f86a3b72caaab84f1896161fc8471223abc63583093208c. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/HKD012387592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe568313b220bd152f4f2e5f11a50b436c0efb920df7823e6fe55f8a5d3578e2. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/HKD012387889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498edd74d391eb168788840c967be988bc5af2b69972447f83a6cc85711ca4d3. 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/HKD012389976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc240580b077a07b2acd17f7c7a4e4457eb0be654c5639bc98a082c0a2ee144. 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/HKD012389221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d441bae48e06fd0425294d9e60fead70041dfadc0eee0fd3948d59ddd4f0d9. 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/CNZ331600247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3661cf56404ed572bbaf453335725808c42125c1fb62272980902066d7caa7d6. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/CNZ331600264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aaa0db8f84768724291201bc997041331c6439e34581c58ea7cc87c84cf9745. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/CNZ331600269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68bc14fb572677c451bcc7223dc9b791bdaf8dd8166699f160b1c4e21be74eff. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CNZ331600272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa558fff6aa2595a75e763d0a472fa50024572587a8c82205f117834d6e11eb06. 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/CNZ331600273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9f1979553290dea7946cb3d6e899c0b462e3886a0df48ff5136efe5be0de32. 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/CNF181300859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2f5538d5d24bbdf1cbb7091d61e656ce127c4c6ada0bf0dbbca618918a2514. 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/CNF181502142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4703718069b0092c6285aa644661a774dcdf707d50d8651c22ecd3c7622e3b74. 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/CNF231500170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9aab343c330d6fddf7245d651b24c595633c5c4148e6cfa584de28f9460840. 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/HKC372410103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4be8d5aee0257c540a66314c9d70d03695a7b1983809d4dc20d0054e53c38e. 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/HKC371804536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198d674dd7088ceb71d795b9728ae4deecd6b320893f0619ccd00ce264e5a3d7. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/HKC371804538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x436f4ed49da46d4f5e9f32b066d9aab1d0d68865a8034371bc7e03fe868f8f05. 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/HKC371763459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9021e3867dc2dabc4e1927e6c4de4db33b224766d3ad0a0c6f250f6f5e225159. 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/HKG732298169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22df5509140e0f0ddd3d52327fbfffd6a18ec933426933fc77c504c3735f380f. 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/HKC371650860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a920ae256bae1d9c9ce4c447831d8559a272c07cf5d956e219ad5b9566edcb1. 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/HKD012387555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a80065ee8bb04b2927e6c997e3a60ed389f66facaa78dcf1c721d6e46bf9cd. 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/HKD012386768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x466ab9904eeb625acc9e8ca54c4bde5434a37150ec045f5052a5b2f502b1b08c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKD012389613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb9299f85369efaff308254fcf4f4eb24abaa51562130af9f0c8f5c54982c8f7. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/HKD012390990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1d900eeebaf9c3438b9c65a8b1559ae5e52dd906ccc2fb902a42b40a91564f. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/HKD012391537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2644e212f2b27ef7038a934bd6d45b7d5cbb6cb095c0f2709a32d472f43e7b6. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/HKD012392688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3ea8726a4f9614b18302220553876ba7a7e8d0bb48c080967ceffecdb9d228. 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/HKD012393043.