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 0x337718ce8a410bd4926a86a48d3e34c5959c8eddc3f79f8408f60f596c7d85b0. 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/38a1f207-c67d-413e-9818-7a47085dba1d.json and https://artists.proofprofile.net/proofs/artist/38a1f207-c67d-413e-9818-7a47085dba1d.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 0x2e74c25c4e56d7043a12759b3a76dd922239819f7191e4c8b2e36a0168722033. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/FRX282404832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a0b24fe999fcb55a6e9e934ef8d86a5b4df3c4c51a5e612bd6746ffef572bd. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/IND832402868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bcfeba06c54a848fb954ef3d61b8b71a79798b322644b0d8652155a9a392d4. 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/INS4L2405204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2722ed678846c17c4af8c8bfea20237746c10fa6ab8b8b6e748cbdff0bc2ee9. 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/ING642411423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ed49d8d0cdcba1b342ba4fa2690381c2a53b115169bdf9401979bbeab1c5b4. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/ING111054886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cebeced20e49a1dc853802994894397587bec6e136cb002fae0b1d68d8d81e. 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/DGA0T2440431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5240bbfc5fe39a77ce1ebbd9a14cc75374277cb8671f625c59a28a31b8b3c834. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/FR10S2561045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d03198945ea718550036ef3301404eb83c9600471979b1992da9414abc8f84f. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/FR2X42599417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x281f3ef794cb913d02972d1e156603cdc72903aa3c0b98ddb48359c2ff3867d4. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/FR59R2563269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ec57d5f3f6f5cb240def59b02b1ecebe51cbe5c09a26da02055ef7bb16be71. 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/FR96X2577949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe28a391d41a5f9a009dcf45b6a1866a4f3b4f013d72bd6059f20935e28c119d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/INA9R2500140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a683931f93c53067c39ee2438610816d28eb8b12ce12f632934dd786e4a744c. 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/INN242517992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf0a96164b18e387db0b2de2828bb3481c304e295cc73b7fafd7b1d7e576b84. 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/INN242517993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537e22ebd0ed0552b3b469b0174e029ac5b0c2de6700dd7a8156723ebaa1cbda. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/INA9R2500171.
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