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 0x3a79e48642b9fdad24fc830ee8f9556f8dc825979bc4a7115bf7b2306214311a. 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/fed1693c-c9b6-46d5-9eb5-19b782208e1e.json and https://artists.proofprofile.net/proofs/artist/fed1693c-c9b6-46d5-9eb5-19b782208e1e.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 0x569ea667c34a65037c2988828574a6c907d4f74dbbb26b24129f1291a5a952b2. 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/QM9AA1688829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89022f473bf2b7fcbac12bb945d299fe79a2e72d33f40c83575b5908382860b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM9AA1688830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10dcdd1a12af4603dc1b2c330bd1f1f414ff502905ea209c69283447603f7dd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM9AA1688831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d2d5b2e7b58713adf73e4f951601ed534717f85baf7cafadbf7c29d88062e4. 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/QM9AA1688832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f909009679655b32fd0e8803218beaaf2d2d6db55041db76eb7de32198e9db8. 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/QM9AA1688833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874bd1b80e3a8b65724e607e0b2b7fe170f0fca043f431f967f6d97af2db1b00. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM9AA1688834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6cc90d438b0aac6cfae4d10dcd0d6eb983860ebc7d6a90b21276e67b2b3d47. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QM9AA1688835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2df93e7eaf1f83ac784c830e6630da56e611fa9397519dbace48e83bca7043e. 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/QM9AA1688836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8358a1b9b1007dd66de6b8081600d21ce58167c7b74762fce15207c8e5820d8. 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/QM9AA1688837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0f5102c5db910e0717e50dca28cb51ce81791f1e6bbd18248396a0defbdf7c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM9AA1688838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0db3294f6a58fb8eea3a6426e0405f752fb8c3c3a2e8557172119cc44ef7a9. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USL4Q1768304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bcd82958571cf19f1e3addafd0f0551209a23c76c934c9912d2f8c56ca6c303. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USL4Q1768305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21dbb8413200f9996ce4054f919150c1e52cc8e14a91e9450334660807e8a3e. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/USHM21478742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b610c29d2ac4c0ef15d4110c44f9e714fc1daf2a7155211b83b2bcde1aac5b. 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/USHM21478743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26034176930f59e801a24f37698658b01519e74990f0a71075728f2014892ce2. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USHM21478744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28bcd873394fa07869ba5b6606582bf40bcf2adcaf6e869dc68358a5c87a4b5a. 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/USHM21478746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4bc3b7d43fb4e4a5cf5eaf12768ad2358097b57c5b08895dcad028fa68778a. 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/USHM21478748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00744cc185df0ec9503630acc6648df44edf66d0a2da5339e88c51b476c009b6. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USHM21478749.