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 0x33b2fd43961ba99cb7a4e52f18ce3c0b5d3efaabf52a5824316d2fe4464adbeb. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3154b50-db08-4f3a-8b12-f7e76936aa68.json and https://artists.proofprofile.net/proofs/artist/d3154b50-db08-4f3a-8b12-f7e76936aa68.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 0xccd403433a806dd78c35c3f33a6621ee61f660762be83ed177a7496642d77ff1. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZK6F2538010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7919831ffcec134424fdde96a44a7443eb0a8af7ab4cf672e4a146e57705e0. 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/QZK6F2580471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cdec5a0a02e4b09bb290f777c833a002f2ecee0e18a09ee7f684e75258e2a01. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6F2578400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb777b43aa1b85fdf7efeb147a5ad6629b856780990ec2358ec4def0f4e10501b. 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/QZK6F2580478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830e5e4996b959648d3d3c3cf631dd65be511625a3b04ad6f5c972eb6a4fd32b. 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/QZK6F2580484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f33e6277a9b7ec56f3101828e18025969f2de1ee7388f7d09617c1bfa282b1. 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/QZK6F2580462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaebc6958340116d43af4b76b49de073a8941101a5a32c5ee225de86e2f39ff7b. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZK6F2581573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66debb81394925d997a99e23e777f32112473f033e7d8b6d65c2d1a2671fead. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZK6F2580479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb660e29b439207fd6d903ecd2cdcfefe185273789eff330d7ebd7c6f25f022cc. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZK6F2581579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce246c34630dfe4a175de5f2e0969af174439c9daf3a5638c6b7c330553dbeb. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZK6F2581585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bdc78fa6a26eb923aa52cc831a0fa11e22351d79405ae2e534c7888587f159a. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZK6F2581578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc8a5cf3622744461722d4f4fe29b6296b736fc1cca7645842ae48407d7e9e8. 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/QZK6F2581584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a4f9fc17c86d7c9e467190e63f976fa2e499d5968e59fe281bdb85f3bd26d9. 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/QZK6F2581575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed701557e3fe5f54a97a4d16f3580d7eae64a2a1bc43334d1a0b70d228da2a71. 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/QZK6F2581576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5682acdea5012d2e05f2c2d6d112cccb50ea1e78a759e91beb48643632250095. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6F2581581.