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 0x742355b784f10bea532bc73033d691ac8de04b7956237f13331a9f4578faa9d0. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cab20752-c985-424f-96bf-da315889831e.json and https://artists.proofprofile.net/proofs/artist/cab20752-c985-424f-96bf-da315889831e.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 0x606f380bbc95e480417ddba799271a2069914f97fcb7413f73f16fbaf06b0f3c. 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/QZW9M2311271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a57877a0c7c138bdae0d8b22073518dbea0530eb9e9ca46d76ec7c8078faa32. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZW9K2426579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd2be5351fc10d283110d6168cc2fcae9762cdf1b4eb864bb73a1525f3c8c8d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZZ792401310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a65ace5a37eb180245e17a18ec40e5c866ac9b149e38dcf10c44328db8cb4b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZZ792401311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb416706d0bc4fee18fd4d90f9939aa8c0fd9261393cb3b814157402f046e83. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZZ792401312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94b5d7dc6f1331f5e982c32bbb1e6d6a2c5c22183b16bc36a642d06828f68ef. 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/QZZ792401313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd34ab305d9e7b3d128707b43c4032dfe6b3042b899ed7323e88602d9eaac51. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZZ792401314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21b6229ee6a40300bb4329a3ec435451ece5a6513375688bc6d2077482321bd. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZZ792401315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1acf4b17bccc633f40233670d71436502ba19599f2b1205ec68bf29597c331c4. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZZ792401316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5774de5b080bfa7ad96873b6aa029e622ad492c7789a0153ab0d3a2b8f98d3df. 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/QZZ792401317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c80c5e389d69eb7923391730dc4d389327e2eebf60f97788a55d6a86f8e99d8. 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/QZDA72588383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782a0a025073387b453bb7e6183b991263c239960bd6e37822b9d38f1c15e51b. 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/QZHN92543849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5053971ca14da52da24e63fc369fed515b1cfb9e703305d8f863fd829d3f3e. 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/QZHN92543850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c80c5e389d69eb7923391730dc4d389327e2eebf60f97788a55d6a86f8e99d8. 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/QZDA72588383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c97041d1e836bd89e1067c0b01b623ed18f39b2bae4741cf9fe5f0f045bf92. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZHN92543851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5a7c5cd75e1cd7bc100cbb52835a75b25e5eba6edc20dafbb339055a237175. 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/QZHN92543852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296a972130521d8383be0ea5c5c69cb7f6c5bffc7a2d31d3806b6c0290f445b4. 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/QZHN92543853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a3739c6bf260b8c0e8de8d650335124b5133213dbbcd137508c2c8c56841ae. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZHN92543854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d92858a6ce73e07cea7bca7c4b64f9ca7efdc83450229f2320f4188cf2281e1. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/QZHN92543855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbd246b889e95c8dabc8e58e5ed8eeb781fd789b4b2dfe0346d56db643d5e56. 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/QZHN92543856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98baf115bf15e7c5c421753b693bd60d58e2a74d92e7302c333c18ecb74f26c6. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZHN92543857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eff99ec080e3c97db6df314793a623912bb15ee346411640f03db2edbd34655. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZTAU2591321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae322aae38a7fd91e22a3ab71058faf330e25aee37063faf18b76b6194aa14d0. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZZ782526674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffecf70aa7c8a1a5a8e2b1a60347426d5d688046842993392dba1ab2e764eec. 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/QZZ7S2533420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb599a08426fffff1520e8a616bbfde64a49217dea28cbc612f440493d89780. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/SE6TI2386414.