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 0x25171928cbaf0708b91555f665c105450ea27d5079290214c91cd936e93be2d5. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/86405ae6-9fa3-4a06-b96f-0dfc7c5ebc54.json and https://artists.proofprofile.net/proofs/artist/86405ae6-9fa3-4a06-b96f-0dfc7c5ebc54.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 0x6ab8266a4ee02897c9b43e53bed4cba9fcf0ccf96d14b9a78a012ea9ee58d6f2. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/TCAJP2538282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4711b5a5a15bd3ae053ea60590729bbb1829e485436d28bb2273fb64db9214e0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZPJ32356796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c4d7490cac0e53c838af76179b46d9a99c977ff33561e1c77b53096d4f2d1f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZPJ32356803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbdbd62baae5a034b6d18e2929460f3c4b0842c8ac6a45400864650539bab6ce. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZPJ32356804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d2bf1e71b782fb1b08eb2efd19f9f1d315e5fb780528d5ca01a7691357d49e. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZPJ32356807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca31a3c2e7de5217a0d566ecc92c7f66b701c37e85431dc5cc81f03372556dca. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZPJ32356809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ab39cd9dba6c6adf97e0ee049661ba473634eced16347c7ad7e2b0bba16fcd. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZPJ32447816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5147b40550b69e5cb58905f7a86c9484c8e0bccbe98c234d0838293dd83c64. 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/QZPJ32447817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540e3c25967603402d5e5a279e507408e1dde6c6cb51f0d7b2566aa557c03808. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZPJ32447829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdaae233c7919f5b11303bcf1ceda871724165a505a62d253be0992720d39fe8. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/TCAJL2576724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacbbabc13bc6d4e39e6d2200f9ab15e8dda348f33673e5df16a3b0e113fa2fc6. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCAJJ2542178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb4aa5f8092c83093c85ee9a5ba2d1c813bc406b22109f890ea8cea92d7a2b5b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAJM2517230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e12153abcfdb8c4e2b2a9d7bc8dab129e33861e4912e82d87f1d1996e4bd071. 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/SE6XY2586951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d69446663a7eb22a4b53dc058055236ab472f490f60a595363d8cc4391a690. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/TCAJR2572445.