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 0x4dad90b2e6736dafbe3f2107283033833ef4c3f9067df24354e875a1da761ddf. Chain 2 (Bitcoin): anchored in block 953864 (2026-06-16T00:30:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/04092f3a-d1f6-41ed-8b3a-52d217181de3.json and https://artists.proofprofile.net/proofs/artist/04092f3a-d1f6-41ed-8b3a-52d217181de3.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 0x44dac0fc0484472f7618b05570fd8535f4c09eee4c7c9952301512c963ff04d2. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/TRBCM2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa96ef1b373607dfaba2a69a3ddccbd899d7f2e450470c647bc8bb54692de658. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/TRBCM2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4622de425d3710f5edbd161446a7a3ee40371e98d746b9339a3791d0b268de. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TRBCM2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a5c499f2920979126c5c71aceec5a62ddb8e3226a45cb7576d5b7d9453ea13. 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/TRBCM2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9778713ceed7609f7221a9c01aec7d83b32292e6654984139513a8b2b0c41863. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/TRBCM2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8df7fe88c75fa4bb4e071f2bd822ef8d9dc1bb23250c3260dadf072328ef5c1. 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/TRBCM2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee5cf068da0d47aaa18326c768de1482c613fb3c0045e924f65cfba790d21be. 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/TRBCM2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfe59aa4742e09ba261d98cd64f999e3ff7956a1f1ddf0a4c9188d4ccb4524b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TR3732000950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d24c60f2998e8df44f66a7c7d90a46ebfc7edd445a426b5a538e96f4df46b81. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TRCME2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc5c36da477fae2f86254f9a4da068735a3013fe81d9335114be0fe4dacc3abc. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/TRCME2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634e6c4c029421898944ce7c25052dc3042547823cb40ff268c4abdba06ddc6f. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/TRCME2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980a120fadf0e012bfd2f73ef48daf019106f2cbbc67777b45aba77119d8f1ec. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCAHZ2499892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008d1cdd71d74ea1741b41d8f001a143ac7ca212f22086849b7e647876c97791. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/TRAET1500140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2291b86bd7114ba93ea823d2d865ae63d0445e5d01a5abbee9e42b08493995fe. 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/TRAET1500142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5aafc32f9ddc250b314709c0decd177d9e58b0fc1e2be7a0900218dbb0d8425. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TRAET1500143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8124b85c56f54c2e5617ce899b7b0e7e9e1e45dae7c6dfccb6ec5c689fa5be98. 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/TRAET1500147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5caf50a42ee22c25998753e9e016b5c92c4ebcb53bb1840d1881107613c1a6. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/TRAET1500148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c988bf7e47228edb890650eec190dc79cab474e2a56fba3060d7bf9101e714. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/TRAET1500153.