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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 0x122d68abd74d7fabb90c58fb4e5e366ce0dc2dfa836ed945ae91142e5309a49e. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27eb4e8b-556a-4229-8b03-60fea5de5e35.json and https://artists.proofprofile.net/proofs/artist/27eb4e8b-556a-4229-8b03-60fea5de5e35.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 0x818ce2bfc6a33e79880ab7ab5aab2ab376bdfb054a04adf4b538b2fd5aecc205. 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/ES40B1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52d386a2ec405366753c79be81b20e2e010a68b2ca4c69da90a1c3209f6bd77. 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/ES40B2000084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18674a83487aecd368fe48dc25e08f08d25ecfcf771f3c6b49207fafa62c6fa. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ES40B2000085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29389e299ea5af7bbc93817c49a61cd1711010101038bea8d697e3b8a328c0f. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ES40B2000087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8225bce1ddcee8e7f4cc344530d722a11f961934abb2e68debd87f7f1bae5ea0. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ES40B2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ffc7f48a9294c8e15b9d28e0d07e981b69671f84c41f64967107388f50a672. 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/ES40B2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda46520dd614f6e0c444ee04a5a500d0fe237d7fa19e5b32ec470eb951e86b28. 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/ES40B2200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d206b17fa0231bd25d01d253ce588011dcb5d6bfe968da2722dbeb28f71093c. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/ES40B2300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea23ac63164a9a5902040d1228f9471492e34a6644dff3be9b7841841e4ab855. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/ES40B2400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a29c31762499ebfafae1a20e293adbf1426fde45e28889e429265b5a897a34. 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/ES40B2400041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42691f319577586b79bdd917e2e326966786fbb72c193689767fb43571f7d6d8. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ES40B2400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5985ca67880b07492cbee7dbeb6b12467de5d3916799514f8b41f349ab7aaa30. 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/ES40B2400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903e30a09f05b340cd353bd2948c6082458cfd962a33e5cf739b2f5371108cb8. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T01:57:09Z), 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/ES40B2400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f531ea0cd51ee85ea207ce375d108809bc0b468ffac30eee6282429ad41d47. 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/ES40B2400048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97716b31329baeb7a2682eeae91ac65069efaec0d1d8f33d09d905a6ec4fafa6. 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/ES40B2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a1608fd9fe11b46102731f42873aec208ca00506e2c3df952503c3c1985327. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ES8242443201.