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 0xc072e4e2f1133e69125709d854071c7ca7d595b929c0d2e255330612ad260542. 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/9187708b-8600-470e-8ffa-4dac34fd849e.json and https://artists.proofprofile.net/proofs/artist/9187708b-8600-470e-8ffa-4dac34fd849e.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 0xd4269e22d644dfe2a9e50b736dc4a72e39a401d31aa91932ad632f3172b5f754. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/SE2UI1101302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3febd0e49e90dca576377dab6dd5b1d3aae0369e25d784284dc00ffb2ba4f09a. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/SE2UI1101303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aef71028336c2cfa1375fd812c04975a50d73cad5b8fd6326d26d61d5688899. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SE2UI1101304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3f11541c443b4a5aae691a54c540710e012ef66e1023a009831418d9bccabe. 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/SE2UI1101305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76149a0329bd9721a877f9f7f30faa1bb5779beec45ea81d4785169207f8786c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/SEYOK1203792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02937e313d2010e95f3d03f2567a04c8f8d239af5c44b13e5a29b436f2b0573a. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/SE2UI1300901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15b8d49923a24bae32afd0fd8b67d2617a9bcacb40ae78190d57517c2cd09fc. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SE2UI1400801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ed7c530615f0d530fdbea9b6745c83cd247909faaf469bcf3c6610acd0e3e3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/SE2UI1400802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc6493cd34dd404fe7ed36c7c3ebab1e3544cc4e205e7852a12ee8172c711ac. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/SE2UI1400804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb273dc7f4a46081b365151778f5fabbec9a68a10361ded5be9cea6e046cec7f5. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T07:27:32Z), 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/SE2UI1400806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6408423d2c8cf8063882017079ce5a3a9d2214b17be7c2606a335535bf8d40dc. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/SE2UI1400807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c22ca4c8f1478649ca5f4b743fcef20f17f0b71c2a321c865a431ee44aa1f65. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/SELNA1502901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325c4756eb0b4ef4a57f2f711e8a04930919b8cb3ec2dae557c025bb0c98eea7. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/SE47G1600401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab9877c26074dc3fc61204f9ac1787d1ef7a71abc9c45fbbe0f14af1b492d03. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/SE47G1600501.