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 0xf9fadc12b713c553e40162007c6273bceeb6a1c50c47c0076d63694b4695534f. Chain 2 (Bitcoin): anchored in block 953670 (2026-06-14T18:07:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/584bd5fb-0f99-4878-9256-a16a2690cdac.json and https://artists.proofprofile.net/proofs/artist/584bd5fb-0f99-4878-9256-a16a2690cdac.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 0xdec7b9e6c5645e324d49b37cb52617c7c48aa03df54e42fccc6157e3c55f704c. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/AEA0D2075827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6178aedf457cb951edf5da6822b2bb1d360a853f33771c1bffb1dfed4fde6358. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/RUA1H1836235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6529e9f8ba996a65e6632cefbc3a42ce898f921d0345d1d9bd79fc9adea2fbc. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/RUA1H1836236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde63caab9fe5e66882b825e04933801ca30f23dd6c1e5de9f3dad0880c9922e2. 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/RUA1H1836237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a51223593caa858cbcfc4268cc2dcec679a017fe74a0e5596f4aee1b7a1746. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/RUA1H1836241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e751533f2eb75b19c91a0d827ddf28546e2826a877d12186cd43ba05730b3d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/RUA1H1836243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda37965f33fefe4401ce329571864e3210a2dda410aef5cff5026bbe45de1cc3. 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/AEA2L2367523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073e47a025cd1ffc9d2000794281bd8c3add1c6f271b5a5506688ec71cddbdd9. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/AEA2M2418251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bfb689337fa1e908abd3fef65b5b93576736e31b02c5dc38f5a36a7e57b8070. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/AEA0Q2456699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70c22f82782b2a9e462a7bd3f52cc0175a5ceda5da7ab7bd2107db4fb4b62f9b. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/AEA0Q2489402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208e7192522bf9fed1e3f5e90240175e0d16e1117401050d0e92acf8eec7aed7. 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/AEA2W2535902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87801c81059978e644fca0b3b0bb54b9ff80b93639146381dfe4a7434fd81f01. 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/AEA2W2575943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1b9a280160286c52172c4b62623e17f313af06f1b267bb68b9a1b20df1a9bc. 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/AEA2W2575944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd5d743d170262410a8d382b9ff285b0585ea97e3f5966512c901f7ad6e9eb6. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/AEA2W2575945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a285136ba70d699fb202bc9f327c4575794481b5e0120d47212510931104802. 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/AEA2M2501376.