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 0x940c2d4cc54799d121a49aba17b509a10be6fd62d7b771bf2b6b371c0111b968. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/95ae2e66-0fa9-45cc-84f4-fe0a2f8fb74d.json and https://artists.proofprofile.net/proofs/artist/95ae2e66-0fa9-45cc-84f4-fe0a2f8fb74d.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 0xd8b3d22d1107bea2ea20f8822db3c4c7b0d5c33f8f5d7f599352fa436a25d51e. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/MTA2G2500010.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716b5d97b2e15dddea82bea94564bf848688feadef91f51f03dd236b08e1e078. 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/QZZ7P2591032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b5d92d73de41728db52ddb943ffbb99d5e74ea9410558ad4a65fb1bc16f4b8. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZZ7P2591033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ecca8557149180d6a6aabfad976c3e60e12789ca09919b50821473f635c079e. 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/QZZ7P2591034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3431fa49892e4461ac41d5c3702e83afb1a790e4071d780495a0c04f98259f60. 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/QZZ7P2591035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9df839b3a96de8276ee23839db8f87decb2350e9011d83d09150d6a32db3fb1. 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/QZZ7P2591036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c0adf338bbbb0481a77268ce1485929c1ea588e9a08ec5336c7f16ef2b5b1f. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZZ7P2591037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd74640106a333527c231541f93993b0706d34c4e5ab370fb5a58387b38c6795. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZZ7P2591038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372961cbb7d9ff536cf4e73f29cf1fc0d63bda371e552eec92faaae6ff617f5a. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZZ7P2591039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab2d06128da30aa061dfeb64bad7f54e75bc7508a5baedd4533da94c4f4b7fc. 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/QZZ7P2591040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde0e6d5d2256d2c20a2fd5cd35f91d16af3b60af153a093cd1f1bbd9cc128a0. 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/QZZ7P2591041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df15e5bd833246d4c173843d2546635104d7d11fcaa9e96120263423cc71fd4. 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/QZZ7P2591042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023a4e90d94f7d4957d2faf5daf62b2ee8f8b775d969d801711f543acc539ec2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7P2591043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1020c5fb5ca5413d4b679209780fc059fb3ecc711efb445259096c8de8d34cbd. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/QZZ7P2591044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b708b3a8a0eadf1c57f6aaa1bc734ffdbf7fc24355ae4958c6f21d919f4a03. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7P2591045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b3d22d1107bea2ea20f8822db3c4c7b0d5c33f8f5d7f599352fa436a25d51e. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/MTA2G2500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5315c87df4a9601661de0d1946cacbac47018f7e9fe1f6370c2d5469be317aa. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/MTA2G2500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06655702ba29bc8a8ddd75e8182a67a2a653c0bf7c8a7c9c0b19a292b9b6313c. 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/MTA2G2500012.