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 0x50a9adf1b7e6366493223a047c05ad4326f5d4493caceda6c19ec0fbcee28a33. 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/388b85d9-6250-41bd-8400-a0b8b1217a53.json and https://artists.proofprofile.net/proofs/artist/388b85d9-6250-41bd-8400-a0b8b1217a53.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 0x008b3127b3344be7b838f4c870c9be2fd7381cff5fa2546faf3c9450f558f5c5. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZDA51954405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f98611b5a450e8632c6bbe2a3256fc999b8a0fab445170530544723e4ce78d. 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/QZK6P1910126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca5fcee781a7cd5d256a7a00466264996daa9fa704fd86683e9d159d1e1493a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6P1910127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3ef5b11d42d018852e560167cb2a6abc3623233eb9835a5cb734ca2d4b1884. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/QZK6P1910128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc71ee7fdd8c03da3d263b83c0e957ea3e9b6fae9ed038694207413bbba7d549. 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/QZK6P1910129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ed7dc168465fffdfd8d3032d36f77b84e68f1578d2e134f709851abe42c881. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZK6P1910130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb64ed1cd1c0d54a1dfe3e42ee4789a61b463d45778eb2f04625a8d2228af0d5. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZK6P1910132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431d3f805a217dc2a11a11891e67d0e51f1894a7b103bd8d584be7239774b8fc. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZES82066673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9d5d33a37ba81b9842b7703cf18375f7ed511d7d5b1973f3194bee147fed22. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/QZES82095708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91a31e7c4ce51fa5f8f682c46a6c3155c37591402f267e976242d84d41c909f. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZHNC2030354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958c4bf4f2d5a2b78e9fc39e3502f7e95d14333d0387ae0a97ca05e5a33bab89. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZHNC2030355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa49fdde278f963cda1c6726f25e48b2fdb7e625019715d4bc3469ddc2951b292. 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/QZK6J2034307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004777b0d42a818b723d61a95bd8b7149a8d05cb88e581bf83cdebe04944b5a7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6J2034308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d5b98c0d0854ed89a8adf47a0e3680f2c3993df8236bf4c605b60a19c007a5. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZK6H2083253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf657b7d64be2140d745dae8e4c72c786c489af7447a354b5e1403e5ea149e3e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZMEQ2021161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e41cae74a4e3696c3ebb88e0fb9ba28783b993a6844d87f9c9712b1924879f. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZES72113022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb682912d2181437af2ac569286472aa21853c13f5ba4601e4c1d2fab725c3f0e. 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/QZFYX2268572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d29d1cf589316b7d92d6479110f0c3e1061a41e92d7dc5b36ccfb5296ab4b5. 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/QZFZ42291780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77cbe0b44f1db78a132535d30813928fafddfb5d7909a9ff3e424c90a1566fb. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USUYG1445862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71fbd34e9f8578b06b5ce57dc4c43891e9f88e3417927cef26f4792fc071192. 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/QZHNB2309696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805f49cdcd8af7324a3e357f5e65b3ea0b42f9eaca8fc98d96c5d6c8a4bdfed5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZK6Q2337558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeff4d12525108a70d5511fbba1d647507eea4fbe29c65cf300ab809ba5e449a. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZK6L2348358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb877e3f1066f9113fd4e4abe9859c2b6b5f541e42806c6fca550926f5b1002dd. 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/USUYG1566849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1fcc6acbc35887edbeb26a9134010a2fb6efc8a7ab7658c349d0183521d7120. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USUYG1584526.