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 0x69321ebb0868ed81df27d553c22549de7aff860e768b128df71382791eb1d910. 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/22c733ce-7ec0-443d-ab95-3f66201fd517.json and https://artists.proofprofile.net/proofs/artist/22c733ce-7ec0-443d-ab95-3f66201fd517.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 0x846a9d0d6bed521506a4487ae9928cbd8ce089dc2e43d2c2c8582c1ed2e4f84d. 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/MXF172427093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214acefefa1b4a542c42350f82bf66a4772faad591bd8981ae8e8da299e0c085. 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/MXF172427094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3f0252de21fb9f4205cc07ec53b55b11ff3da94cb3f62d299043dd6b421997. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/MXF172427095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05a7bc09704d8550f4b705222f0f122956843638cb0e6e5553f39429425d955. 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/MXF172427096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e88e88545d175e7b0e911cac99827b842417eda3ac8e891194bf17fb399a1e. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/MXF172427097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45777f51f26608b97fc9afe2e72d39153d2705799ae23ee820e513f09ac62cad. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/MXF172427098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3460ccd6c04e37345d28adc8331ce2e92b56e7253918cb6ef92b94c0bc6ce20c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/MXF172427099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc9a09ec8542daecb252ed2c94dddc2c9057386581c9f4cfa43ef18364a804f. 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/MXF172527944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd455a3a8993c16d2a646285328011ee1a22c84743c18ede6935936181f4b068c. 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/MXF172427668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c03d88cb22ff14e286c07cd8c59cf4ed60032510bedd1e360e261a5cc879e63. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/MXF172427476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2438ff7f1aae1443ea8ab2a432da684b095ae657d26896bfe06f761828f41712. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/MXF172426973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16e4ed07c4be8e1afea77815581c9077aba177ab1a86dbe7c0da01f66607274. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/MXF172326861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0335c8c287c832e99b5aace1cfaa6af7211b1bb617e4ca13e8da4f7527672782. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/MXF172326851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb90bca831524353eabb066e8fd8b6230f4769f94b97241b85e3f4284416359. 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/MXF172326552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316444cd985c5502ebe345a4d8887783bcaf2a41720c6942f5d77936f928738d. 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/MXF172326212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881665ce1af4e7040f3271b5b9ab1c5b9587d37008f6be5bc106a79dd03e332c. 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/MXF172326211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7db832300cb3ad7b31117d51bad16b224559482f525fff89104d9c5c96f7ec6. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/MXF172326210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17fc916dcd04cf87096658505900e2c828df3d2ffc5f5f9808c2899ffd0c4880. 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/MXF172123986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16c952263c29faa60e0e9a06dd250e185f437e4208d3eea78f527148530c9e1. 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/MXF172023741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9043023d77bc7af0d19b9be5f99fd3313ebdc81e9072e64ef4b5d9e195b20d. 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/MXF172023413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63630348b91c576d2105df6ed2a648706a20ddf18df37dd850b5f5ae7815d6e. 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/MXF172023352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f153f40b56dd468791da49fddbf2b75e0882c0a90a2577593acd6fa31d2c2e5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/MXF172023345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe550e29a7b3383b70b03703bdcbe4c83237fbd226d241bed0c8a1f8fafc137f0. 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/MXF172023319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3ee560ef0e49e1b9bad27da1b3dd096209102f0214cc5310dbf39d495b4bb3. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/MXF172023318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62dca1eb4463afa1157388d5061d75870a178207cefed662caa9c616dbefa337. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/USHM82010790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32b7149427d99e6e82afaf24bb2da817e9b4b24b96001a31e24b49207db7b5e. 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/USL4Q1947922.