"The Chain" is a song by the British-American band Fleetwood Mac, released on their 1977 album Rumours. It is the only song in the band's discography credited to all five band members of the Rumours l
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 0x97125e4f97a41cfdfc0012f7e64d30c4a31f3e8888399e1a32a7f99212a6e0ad. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc86913f-af54-4bc2-8739-a5bfe77acdca.json and https://artists.proofprofile.net/proofs/artist/dc86913f-af54-4bc2-8739-a5bfe77acdca.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 0xd60491f3752408cc316eab66d482bdafea782271382933b581a30962ed040131. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/US38Y2412305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8a8b1c3255ed00bf6b20fa47ff39d8aed011dd09e36cebddef28f94df2e5bd. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZTLA2513369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817e2a4ca86c5d435e7c763514cf25200093f5af99039e262449d03aeec4eea8. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTLA2547309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc900f3f10a0586f02c994d23c2ce87ee81d444116a99aaa3c58cd5bb98c1ed. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTLA2539062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc404ebcfcc727601c732bb816032fb78cbc67329f264ce79c5840444ed2ee1d6. 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/QZTLA2502606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf23f18dae10897cef5eed59ac2a00c7aea711c33483c1d53cb9f82f025495ea. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTLA2581430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe38c6bc3d79fd686135ad2fb362901aae4c2bb2610b32da0aeb75de958ba1f7. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTLA2590491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362bad00b46a8c58cb8f7e32edfd99004360ab3ca48533fddd00d8aa632e0c5e. 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/QZTLA2526909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec26c282b3c36f08ceee77ef47d8da9d66d6159b88f07cc862b48b585c6a2f68. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZTLA2598310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5a227c5f00e44298f12f2bb36351c3df25bd17141bb9f1ada023fde5434b7b. 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/QZTLA2538660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0cecc132c681b35d6ec915f835f92d07960e76d6b1d087de8ae939367e6ed80. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTLA2586475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8a8b1c3255ed00bf6b20fa47ff39d8aed011dd09e36cebddef28f94df2e5bd. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZTLA2513369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc900f3f10a0586f02c994d23c2ce87ee81d444116a99aaa3c58cd5bb98c1ed. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZTLA2539062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc404ebcfcc727601c732bb816032fb78cbc67329f264ce79c5840444ed2ee1d6. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZTLA2502606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf23f18dae10897cef5eed59ac2a00c7aea711c33483c1d53cb9f82f025495ea. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZTLA2581430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe38c6bc3d79fd686135ad2fb362901aae4c2bb2610b32da0aeb75de958ba1f7. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZTLA2590491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362bad00b46a8c58cb8f7e32edfd99004360ab3ca48533fddd00d8aa632e0c5e. 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/QZTLA2526909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0cecc132c681b35d6ec915f835f92d07960e76d6b1d087de8ae939367e6ed80. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZTLA2586475.