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 0xbf99d0d38084e033eb56d97eae34c0e0bac98fde5c3a79014db022d4d3213331. 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/a87396a3-457c-4527-bc29-21940f7df5bf.json and https://artists.proofprofile.net/proofs/artist/a87396a3-457c-4527-bc29-21940f7df5bf.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 0x013472c89b6ba1944d57df54cc7eda05fa7e380501acaefab3e84a7f14ad5f2a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/IL1029800732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a971d6f7a3cd7e02a25dda6de8f95a005772462b0b69c283176c2428abf6818. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/IL1029800723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf20022ab8d1355f512ecb999857d50918ce55509aaec0ea814d69be3fd1f37. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/IL1029800721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845ee6f6dfedb23a8adcf1ec34b23bfab1fec9dfcc7388664cfcb25537808638. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/IL5842550790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8dd32159f4b961fbe493f9d9d4491676282434b24a7d4f5576cd9938f39449. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/IL5842551712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e718497ac059a6fc8e04458e2a2f2db47fe19021e20e78b8ce5e29927ba573e. 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/IL5842554002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9bded6afe9587c7fff86f5aed4aa03f04bbb18a259141f108f885a9ea601ea. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/IL5842554003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e97b3ba7de1153b7598e6f00573ce296006cdfa29195f67d276e1684d2bece2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/IL5842554004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50f8942534a307042a20ce01b7e703e3b8cf840f8c5c327a46cf32fa955a6d6. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/IL5842554010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119645752e31d94475f61e9cf767f5688613198a0ef43cb778b2a82d26009d13. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/IL5842554011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa71db9fc1cd4abf39b7a739309f3ffc792d5a9777bbbb362e37d4bc57331651. 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/IL5842554013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb377406bb20944ba39cec3af6a67d454aeda0a307b738c737bbd58f16751a570. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/IL5842554024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60223cdca752ac74edee0afc0a427281345ae2d21fd1a8c03adbc0abe4301d9f. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/IL5842556172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd01174f3dda5fb8219674ad4e32482a4493448ae9be014f4aadd10156f73354. 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/IL1002100338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8580adda645c3fd1e470a5a81261e3fe03e56883a40e8a7a9026e82e3875cea. 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/IL1002000223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83f9a5be6b367d15c31a0f2b24be4493a7909e28dd616d936fc8626ce5a06bb. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/IL1002000231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c4f8b0253f65df161209df35b14911aeb6107e7556872baca1a1ba9977e7c1. 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/IL1002000221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8a8727b631479bc48b3a5300c56174a64e0e49ee18b71bbf299d739a90fe7b. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/IL1001087192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc992eb0fafcccced3ff54422777c3c8a0791098d024f50262e7a1f3ddd28dc0f. 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/IL7532413474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb8e296cc6fc28c707546315ff7cee53a37f1197a51854f38347178f082ef41. 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/IL1001085593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6b3ec208ce20029b5e52f5f25c63d2eb874c0d59ef4aa5a1e5913be6de4a91. 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/IL1001085588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6b3ec208ce20029b5e52f5f25c63d2eb874c0d59ef4aa5a1e5913be6de4a91. 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/IL1001085588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb8e296cc6fc28c707546315ff7cee53a37f1197a51854f38347178f082ef41. 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/IL1001085593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5e1d1c72ba764b43ebd7f7f37f137448e031375fee08d660f085340b3297ab. 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/IL1022011637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e28a9b117758920a26afffa2adf2ef7688671c70fc61a5e5832bb4a8e580a6. 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/IL1022011939.