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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e9035904dc57ee538c6653b1880af326ff88d95994cae4ab6acc76a247196f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/59ff8837-0eea-4752-bd7e-3248cebac129.json and https://artists.proofprofile.net/proofs/artist/59ff8837-0eea-4752-bd7e-3248cebac129.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91e37859d799193047d3059cbdf62663b11d3919affabfc2f4817c576428e99. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USLZJ2185433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0e682fbb02c45a080b11dad9f6059f9945e5229ee84484461546cc84529d42. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USLZJ2185449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f49704a7ecb9b12c8ff9758995ea04ca9bf940ff28f2dfa186d4287e49cd5d. 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/USLZJ2185452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf698c97d9bc1bb904ffc1bd3be2e24a0a6f5c212b875568b769ccec439d903c0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USLZJ2185454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f9dffe56250b4dce1c7116ab22360cbdb227ec1c1c9f047f7035e3ac98dc12. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USLZJ2185440.
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 0xdcddff823214a5a9daf4f09653b4a6713581b8a1a28290b167801ecaf458535e. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/USLZJ2185447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5923dd3ee583fae756a5daf142cbd4c9881a290421807e59afe8a8871113b9b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USLZJ2185450.
Julius Eastman / NY Metro xylophone player
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dff554ef8e3b5acd8a3ed16e8d5695ab5d07d380961eccf31459f6824b2af3a. 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/USLZJ2185451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71852375bf47b6a9536e05111ff7e85001432c8dec65ac41cbcf748666a9543e. 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/USLZJ2185455.
Julius Eastman/NY Metro xylophone player
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa3173b21cd647cc769e09de60c525164ddda32a432b2f646fbcf460b211388. 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/USA2P1952600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8dcc968145b479c00897c051c0a1a27a641f4ae0055736bec2d73d939bb800. 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/USA2P1952605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7caa962aa9dda9d047a780077ce80ad3bb56042baad9a31cf37a73e50eb626. 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/USA2P1952609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ce75bfd8c18329194c2ffda77659c3626ff0628a00f98ec0d52b782dc7786a. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USA2P1952604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d91f65ba9d591b078a2805cc44f7b00755df91795df5a52f7ed1d281e042847. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USQY51722157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98cd3633a4ba7fc20c5c917b9ef99f622a16f9661ad331af5a0b04729a10087. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USQY51722164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105b9682e8a4aa75c758c1a8b3c4a2269e6bb7ec8f4b1153ccf143cd1da569d3. 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/USQY51722166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7b5aac2633fd51180a33c6685cc5828dc32169d74015caafe0e80d5a3871cc. 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/DEG931912187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d929d5d2bd76219b66b7a61f94823583a7a0688b2789a0bc677f003c177989f. 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/DEG931912323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f518102f7a7791abc025dba2b3b6d70e6baf2b5191552de7cb614116dd247d. 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/DEG931912325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149a55f5e92babca1df61d0af4d4f7e390feef0c7a366fc632a8a413af915193. 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/QZMEP2242326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b02ec0a5e6cc2b08a01c74afd78cdd5eeb0c83b849dac1ef8dc4aaa5eeefe2. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USLZJ2142683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4622b0393547a4e0f0ab3ba490cc468d74e51c3f1605300bce9fdb83b3d38bce. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/USLZJ2142684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4770875eadfe7afd6fe366aff58ffdcafa6ae9ba984c1d43b1ab1af5812585b9. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USLZJ2142687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5741aa31adbe2c6bd6942aee2b905ed7083cb4203ee905a075a0eec5911a6251. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USLZJ2142689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd2d02eea3be4d53466c70c4f8b0561a39f0251e71f2f45bf281f905693ece2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USLZJ2142690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01c8207618fea583c0dce370d40bed0b6cfd0b5754f59b962e3b7391551a86d. 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/USA2P1813286.