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 0x87856b13caedcd3dd6972fe4d1e2ee02a7abe350856fff2229024b6f27cb3b93. 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/f882f2fa-20c8-4a0d-ab40-d72b7d25e99f.json and https://artists.proofprofile.net/proofs/artist/f882f2fa-20c8-4a0d-ab40-d72b7d25e99f.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 0xee22961cc6deb60d4ac06f7f422712532aad3186a5400b6727a18335532e011a. 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/QZNJW2022173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c879ba607600d7610c10e89be1afdc04495488bbbd09368f77d40d10188475. 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/QZ5FN1723165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7358f2e5ab89f33d03e169964dedf6095ba3dba54469acf3d78f571c5dae849. 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/QZW9K2331406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07f02db2eca3b8aad6890bdfe74c227b97081dadb01f3fb357d67ec4dc117c7. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/QZW9K2331408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe6a3473f2a29055d298f5cf9cb39ee58a2ee47af15cf349adb5453235a76a4. 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/QZW9K2331409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7dabb0ceaa0cdc48fa7d26da9708e152dbcb97425ad4ae019aadf570999d20. 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/QZNJW2254887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a7e15039d5de13d50536ed3e9a81610c1a824936f364451d9d38e002587f1e. 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/QZHZ42253810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe866871afb66e1c7511999c228d0419456d7b933847aeed0b126c52adfced6a3. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QZGLS2242728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028c7059fb1f348077a3e37f22a4952aefd0c592d3d89bbee2aa88e8c15ea339. 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/QZGLM2124093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ed9ca916f611e54197963f5ea40ece2849b8c231953369741fcabcfc05d23c. 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/QZW9K2350477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce688f5e68518fd99c9bbf17f84c1a21330d8e8175c762b7008244e7d015709. 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/QZMZ92189456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38202f03ffa1d57fbc0bd8ef217467287b52c7f2b361ca85c7fb016dfbfcad8. 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/QZ5AB2173279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110e1454029e5d0204821023d56b1944e6d8f2547457db010ac27622d4afb9d7. 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/QZHZ42025531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb270a11b7d45f3a81cd366dd47d7bf53476729445826c01632e413e6ccd4f175. 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/QZGLM2097987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253e092a4113fd571f7b1297ecdcb65bc151dbe8198456a9f2103d74aeec074a. 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/QZGLS2010994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4734566a0e19932259ecb93acb106f627f31bcfc831decbd3c9a7b9eaf4cf339. 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/TCAEO1958665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273e3b15192850afda2e4e6c992dca7c35fcf2ea056f20849228163f15358adf. 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/TCADS1887861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef344b41a15bd17cb448891fc0e4f30bfe4c8259b817932ff4823bd6a0479721. 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/TCACZ1790455.