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 0xd92218ac758a29ebca9e5dbee95377ee1b043b525e12b38b801dc25add1865e3. 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/dc628dbc-1d59-4e67-8781-45808f698be9.json and https://artists.proofprofile.net/proofs/artist/dc628dbc-1d59-4e67-8781-45808f698be9.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 0x5240ed244f2d4a45b6ea214471b2f4d8f056e0c5c436a6573e7a6dccf9a534e6. 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/PLS711900629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35408646f17de6b723435230f34c64c94ef2e6172d14a667512be001b2a53836. 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/PLUM72000560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70625d3aac2f0e591b0bc799e28f3eda94336d0710c4dc298b26fa601239fabf. 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/PLUM72100510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7be62e0e309df41b5968768d4c3a9f2318f825b2d642b454b6e7e65c41e0414. 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/PLUM72100511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe107d49e34c014ef81b649e9ed8863a4d5f27809ea81ce10787fe389fdd9fe. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/PLUM72100519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d5f102812dfb7e6bbf267d16612d82cccdcc1290cb3e1bcae8a3363f3fb3e1. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/PLX971800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708ccd6d1da4e1103dcbfe5fa864a2acd864307e0ddf87b854112dc16afe503c. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/PLUM72100512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d2bc9d677455de09e7e2c2c889b2d206812f8e8e3d5bce35012c2b6e29d918. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/PLS712080802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9426d8e7e78cef71dbb35d9918e17a5c2b7110b5b182653e14392a05fa48366b. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/PLS712080807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7a8198698ebcf2e88f1856b3a52c9b97de1b05e0bd512e0c73a3379f4b9ad4. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/PLS712080806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e58bc8b0a9692144d7ac2a366fd5ff681ad4dbba79d3bd6324fd39372d9a2c. 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/PLS712080805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9953e2466fdf8492ec10f1c5e1920404ba0333f981e35b590385d27efac749c. 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/PLS712080803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe728f2e79702e07ce378281b71eaeba179abe5d05d8b7d6c0366c1756e5c46. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/PLS712080804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8b6f9f7af59268a732657872bce39d7ce37530f5cd3b1272504b8e0a7ae328. 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/PLS712080808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8faffb908f6e9e43c3d51aa6e6365b674a921475f6e76d10f2357091f0438e63. 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/PLS712080801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e966696af7166bc11a75a35c028307e63d4135295b438b4ede77df6ce888775. 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/PLS711900613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1587017c75f6e193e0ae4d28db020cf6b28658d38426812a9c6c36f65a97c045. 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/PLS711900614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e552de3221e9ad217ae86c5ba9151a7024c43c54afb80e062f0f50439d7149. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/PLS711900603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97da16b7dfc7c140ad48af3dfe88022a7dadd4672884ea0b6acdd8e5b3458991. 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/PLUM72100160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f785200f0fb9dca7e41a33df8621279ac7a2fb4ce5eca40e71daa6509f9407. 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/PLUM72100162.