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 0x2e6cc6753656a6acbefb2a9e5d7df1e2de6cb13d54ce24bd3c0a7db54ac65562. Chain 2 (Bitcoin): anchored in block 953695 (2026-06-14T21:42:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6e73afc3-ebd4-4ffa-9a2d-548298de7d21.json and https://artists.proofprofile.net/proofs/artist/6e73afc3-ebd4-4ffa-9a2d-548298de7d21.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 0x4b0d510237b85d2a8b80127d38cae9bed18b2f8dff1d43023a2dfa83cf05421c. 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/PYC842302533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279cd885146ad158cfdc3dd8cbe4ff8da8271c1feefe88d274d09fecd9204636. 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/PYC842406032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ed17c4568f54b1990638cb1f0ba151e58ca3342a91e4842d73416305545dae. 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/PYC842401866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0128490913e5233e950080d6312342b8fa3ea15003da0a700a86873571ad8432. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USL4R2134443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea459356c7301752f6814c25c057f65c9b1eb0ea05e8a793b30760d91726e44. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USL4Q2157234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14404c78331e4ac6fe96cffa3a2faf93ce8cb43bd11a80669320396d9041da79. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/PYC842500965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f59778185594be1913f63cbbb81a5745733c8998382969d14d4f553bed68d9c. 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/PYC842415512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb54f91da62baca22c0b30156b574ba6619bb9ba277e6110d091ed819e37c2a. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/PYC842415255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef3dd33ed830e6e2c3f7677e4cb4548c1d34db6062778944376311eb4b10e92. 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/PYC842403945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29cc2ab095a39ebe89c57ca3d36eaa98179313e03046a2ba754c4795977a7f5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PYC842304353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3ca70632b910ad0404d311b4cc60b05908bb86358840defe579bb4b7725e97. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/PYC842304316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a054f396b95bba4003bf8cd4fc150e3d936025eba2684b2a6ea889a4f41aca. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PYC842500959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c20135ec091b3a399dc40129c18c93334a01cc5e23416029f2644f98f612910. 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/PYC842500960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78a2dcdb14a9df10cb32c201e8cd65e46623478ff93af17bbd45bd79e755e17. 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/PYC842500961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce889de057c7fe5bede49aebd88888903b27a3612803aec05066c856a7fde1c. 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/PYC842500962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0563561bb64fd60a1b689dab18fd09c382a3e5e50974f20b7915777e73e62211. 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/PYC842409861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9be899bcf8f1e2ba205930665d3430308bcf2b649b92e1c77957250be873ad1. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/PYC842500964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14404c78331e4ac6fe96cffa3a2faf93ce8cb43bd11a80669320396d9041da79. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PYC842500965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491dc80f130f7dc30cdb0a4cf11436d0d61442548fa656424ae0de1ffcbbef2b. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/PYC842500966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf57356c905fa49398e30b0351aecfe580415a78ac3656dd911a346054c0a2c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PYC842500967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef51dc0bb2fe54b1ead2120a04acdd61cd98d42f88225b00bfc236bee5619e5. 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/PYC842300561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661dee535f32be3e064543a7b826e3b997b36309ffbb7b3169a5df6d9eaf4245. 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/PYC842500968.