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 0x63ca6bcab5e326a455c20b72fa11227402324c4b9ec681770ac74b8383406f23. 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/f67975bf-2745-48b5-9680-7e446e3386c0.json and https://artists.proofprofile.net/proofs/artist/f67975bf-2745-48b5-9680-7e446e3386c0.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 0x291fbe4c0236ac430dfd02c683b6ce267f7ff2ae45f4c39b8d95daf37b989992. 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/INUM72400692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a5d228b72b4f55fe20407170f3438fa7a73a3639e78376310e9f138b26e8ac. 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/FR2X42372368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f31d7fd24a6e27084fe555fde5f793414fdb5c09feaf17c6e95480bd897e99. 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/INUM72300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ffe22602d7db7bc89c8715ea9a6eaa1fe031e37e62fa687a9bb9a84d007e07. 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/DGA052293970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23b74ef40b045ee4e241dada72b511dd4d8f7786046acb01fb8e680a8a7234d. 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/FRX282294102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a19a20cbae6ec337a970be1d46cefdd56ab9d1e36e45e4f0af31cd85fa62e48. 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/FRX202273190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0e1cf7309c9d5e38664cd46c9515e71b80531e1fefa7f16db2ef3075ada590. 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/FRX872164978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840a0dc2a6797a8a1ad7c7896925ad5a10b70a1a449a7a7832f24143cfd7d7d9. 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/FRX452172615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b76d1a311138959257dd8fec52ceefc5b56b1809d2e78e015c4e13a28e43a9. 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/DGA052039255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07233cd2efe22dc7ae9aea0f0348f3068632b2251c2bc6e022457e25307cd6fd. 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/INO132000588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fa11c5c2fb5c32b5e34c6ba3d1136263824f8baef4ed3557c9bc63aa38b15f. 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/INO131605047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48390f100feb882699088efce648d7f26ac107bc84f0937096d3264a71305509. 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/INUM72300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf3632e9f86ef33b8b90026b6da0c6a30faadb1af0cad062c34e6e59984cddc. 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/INUM72400721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3785ac32c7a3e2448c313cf0c178af7e3e86f7a3159ee8ad2d65c27460a16d. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/TCAEZ2083117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7def09a8a81989e560f6f6efa2b432600ea1ce3fa824c85f1e33ba0469228d82. 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/INH102500982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa161c0cd810f237224e89d9264e9293394763ad1621ff61642ee5496eb379513. 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/INH102101343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f962fd75a6e04e268383c5a84e2ccd38eefcf54aaf5ba297d75c18b26794f4. 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/INH102102047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496fdc0b9844cc6403db2812902b89add9327fd69a5bcd6c4b6c9d6d17b81ded. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/INH102202289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb28690321fe867a252a2b8c71002cc92c85c6e9a017bd0a4b47b41dc5b0b5f4. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:01:45Z), 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/INH102411887.