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 0x969ad052c1a3417d987c6801bfc26e41d0aeecdca222ce3799de3617bfc7cf8f. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bf643387-d73c-4e34-99e0-531c051b2443.json and https://artists.proofprofile.net/proofs/artist/bf643387-d73c-4e34-99e0-531c051b2443.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 0x25ff1dd511030ee9000c6734a46dd22c7974f54aecc61a777e3e20a148703f3d. 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/QZHN41904699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5292b34a3631d21b48a1de172addccd28652fd5df1dee1b73059d743d0addb. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZHN41904702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2155c525e6575455f18b6989036e3abff81f79ba7af7a9800966ce7d2096be. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZHN41904703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293c0defba9758fa80c9b5271864ba249abd262aa67d3fcf97bfe9a3299cb6f7. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZHN41904705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc665796569c94f2e523b80c6fbe9d6850dce2571a16a8c99821d08ef876cb62. 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/QZHN41904706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe682e3b83d2c2ba75c08d13595b7f78c73f5f067720a55a2ed7865f9fb3eb7a6. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZFYY2015723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27f14be09dbd85be5446f335d3b67310fcf4430bae237fe2c4313a2f3cc16c3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GRSTY2100964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6558f72ed9211fa221e5f6badf10f6cf1c94dd76b08cf390c348734388378813. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZMEN2240821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68279f73fcf4bf3fac17ef2a785d41b03063d9f4566f93ef9092e6662bfe485. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZTBA2276130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052c7e2a646ae7d13958c86b98e21a223bd14303b4dadc6c954f6b6678a8e831. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZTBA2276132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955d23e7f33f319b6021340e69a80f87911f63fb2ffaa350e9bdfbadf9500f97. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZTBA2276134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17aaaa3f4e0a5155ebebcdde0b9c9cc7147387f4acc85c1bd34de5b4aa68bdf7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTBA2276138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031910ad8661265a3da6d45be06b4ead4776a3d83c098a3feb4e1a0b069c606b. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/GRSTY2300248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00cdaad0ad9a1cc4fa3d970ab0078874a4721a8b08172a5344e9c94e716becff. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/GRSTY2300339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722ed2622a2bab69901a30e46265b953fc619db0e8bf12cf6b00738e269354fb. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/GRSTY2300341.