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 0xe3268dbed50d55fec5b8c0d542ec2beb9d5632b54665adc4df26037727a91675. 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/2f5e01be-690b-48a2-88d2-aafeefa11566.json and https://artists.proofprofile.net/proofs/artist/2f5e01be-690b-48a2-88d2-aafeefa11566.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 0x02632198f91a7ff4d8941b19ff0f030b552cb768a3f1697d6d9427430580c22c. 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/DKA4Z2000201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d9da76442fa473cd7a51cb9d00cfd2e9ad25480183eba2acbce2957a876f090. 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/FR2X42216807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x977ee51cbee3b463b716b46b67a21abb3fcaa0dd0490d50f29e0bf76359a89ab. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/FRX202247517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea65f423778e2e2410b2ee700937e20ce0e42ee6f72fd51aaaee892d4644d275. 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/DKUM72300057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bcd6a53a6cf70cef5b451bf98e42a746ceaf578846424c40ed3aba42118d863. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/DKUM72300539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c19e157fc755d6c63800160bea0fbb035c8086a61baefbf0f8eaf7b763f9833. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/DKR642400801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30168e09ad994852fa15b19e2da4d941d3fcd1a556a278b9af75eff6d32f5f6f. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/DKR642400802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb115e8ead7adaaae82f6b1e791fa4d7e4232afc6c8dfe3f7214a4bc3c3ac044. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/DKR642400805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec963bbd7f7d1408cdab6178432005d0b638075bf11a98f3b5e3a2ca36bd0d4. 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/DKR642400804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30168e09ad994852fa15b19e2da4d941d3fcd1a556a278b9af75eff6d32f5f6f. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/DKR642400802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c19e157fc755d6c63800160bea0fbb035c8086a61baefbf0f8eaf7b763f9833. 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/DKR642400801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb115e8ead7adaaae82f6b1e791fa4d7e4232afc6c8dfe3f7214a4bc3c3ac044. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/DKR642400805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3f082d5e1d9c980b81d746b41d68d4e762c624692988aeb82027a7a03deb9d5. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/DKR642400806.