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 0x62d8e9b35c6936ba34a997aff637c4feb107b98e3db049354fd3a6a6f9f18a92. 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/c5ed1774-966a-46c5-b695-a942f16ef151.json and https://artists.proofprofile.net/proofs/artist/c5ed1774-966a-46c5-b695-a942f16ef151.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 0xefe3f35c268863eec3ddd60b178e2219497ace7ed5d743fec8454d4c5a1bdaa0. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/IL1470700371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bee2a97ccdfe4268581f6c0c810d86eb96b979bf7c11e895d5f998ab91b5a2. 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/IL1470700341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb41d6971b91bbadec54e1708540ed0ef2fb6f850c7579f694a3c0bee17a64d7b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/IL1470900488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38507926ec233f0651bdac90fa6e2e139bc14902a20793d57df609c44e8668eb. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/FR96X1849554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e503c8a5e35bfe821676c877878b9a8cce486bdf4f002da73dffdc10a755bd9. 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/FR10S2168350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ce3611176eda74786827c5b5c16362e7dca2573aa21d92241fdcacab786187. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/IL7192100582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ae848e3e234849451254e70647ed98a3b0c77c037ae9e67e7a308f3b9d96e9. 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/IL7192200624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61efb5a9e25db08b7667160a4e4deefe261e1c9d0fb0c2d2a48c9ebb3600da3. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/IL7192300317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb6f1e8db8deebdbbbd70e03dcdf185634de6fb33935c3955fde2d044186696. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/IL7192401269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570fbca76548a3efcc986cc109a9a6dda16d599c8b3f52ea934a81eb39f5ce6f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/IL1011122774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f251599a9d72e8a68dc484808b18a149cb470791da2cae753142616277038e. 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/IL1470500071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e651e9c9eed38b19a951ca0259664aa0f07289dcbde334d16cc754507d6f50. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/IL5821500907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e290ff98f9e9c50c48f8e23f048f7e06d02ea673311fc49dbee5242dcf717c0. 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/IL1471902467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9c6ee3c62cf317f0d476e9394a5fa310a2772218615571d955bc22677f5d58. 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/IL1471902470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa2768acdb808229588344dc87028ca77df4a5375c2308440f9a1493bd3cc6f. 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/IL1471902472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b15e020f7ce10823430510f9387c16b610deae147dc7746dabc28cb7d8fc9b4. 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/IL1471902499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986be030bcbb269c8a13949488a7b7b356d664837145a68b557bf5baf3b62504. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/USDHM2005802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160f04256fa8755888eeed50ccb64088c5a1c1484b6da0a23cda93cd5033aba7. 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/USJ3V1462062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c312766995e7b4f8bd265e4f5364acfc17e5c48ab4fd967fe2233cf361eecc. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/IL1471902809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b55ac386c7e861fc3d270486c6a0a0961839beeb2915f9bddccb4cc2de37f1. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/IL1471902815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca727905fd0afd98fa820543ebb1bf5c666b2111415be4eb07e902f193c6d157. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/IL1471902852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3f0688628f5dd179d97730ac48d631719da99ed098a85ba5a6f6726bf5cf27. 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/FR10S1871604.