right|thumb|Slope: In mathematics, the slope or gradient of a line is a number that describes the direction of the line on a plane. Often denoted by the letter m, slope is calculated as the ratio of
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 0xaccefa2524e2585db2ee0a493ad6afcdcd3d5c5e71dd4cecc7965ed6dbd36f5e. 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/a235cced-a5a8-4637-bc23-78227912818d.json and https://artists.proofprofile.net/proofs/artist/a235cced-a5a8-4637-bc23-78227912818d.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 0xd9eb928996971aa2e677d2920fbde680f3ab712bbb4a649698e796895be32ebe. 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/GBDHC2442003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae9e2b406a981d4a5cb8219da83c4d74859266cecfbe25aaa59d801ee416871c. 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/GBDHC2442005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1afedd07fae30e44a162c8c9686852ff4293ac030d6bf1110f514a3cc6dbc007. 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/GBDHC2442006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56b662cc2ee43fb0e988af2b224af6b3cc399e531db8db964b52509bc93d088. 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/GBDHC2442007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f706d909caf7830aca56c0a4b29fbd0a172afe3cdc1078645790ffb7a1e76e. 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/GBDHC2442009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c079dbd3c07b3c07501b1020f835c13e5dc10951bff762ce9cdd9098e2b5c68. 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/GBDHC2442011.
Out of the Blue into the Black (feat. Deluminator)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa73f0b6eb25cb4036d7a4bee4e88d7e5d9a48ee682d23d273e79209dac6fc1. 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/GBDHC2442012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1469014b2b53690476b5a8e1e4dfe4d52c0b7c757e91a992176ef2993524ed6. 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/DGA062011327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c826f43432b9c53d4daf28d95ff115a257e0724fe64bcaaf58650945cdd475. 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/DGA062011329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bffd28eb2d9ab177bf9eca0bf0c86db552c3e2de51f693ea1023ea1b9ea3023. 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/DGA062011330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a63dc810e9b54fc6e8e2e34161d42ab1bf8370ea0cfe14819712d19836a7247. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DGA062011331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6560c095d54be380c67f5b752ea1a2edc199c9f820212248649fcdc9d183d1fc. 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/DGA062011332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea2fc0dd6ff08c996e3db1855c1715783e69cb128d777f7658f9e8c1038958f. 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/DGA062011333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3219c3ebdfad2b4ad30417244c734745507c8acd58855869227e3b6db3691d7. 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/FR59R1742225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a39ca0f24461d938ca321d3a5d9f6683ad14921c60ddc0640aa17b1531ecd7. 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/FR59R1742226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8db699fb98290a98d0a0deb5d77a56998eb48c2c0b49548194c574e697aa38. 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/FR59R1742227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b16c1930b6b4c420043d249f69a6587088f46b0063a47c0a96d4e9c1053249a. 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/FR59R1742228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c9def323caaf5ae2431d201687be2ddfad64621d6da7dda974a02b197629e7. 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/FR59R1742229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2670765f0bca43c4fa6085904125640cd2bc359f345ac15af1e6488360960b94. 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/FR59R1742230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8db699fb98290a98d0a0deb5d77a56998eb48c2c0b49548194c574e697aa38. 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/FR59R1742227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2201ff17b2f47d9842979c0ae85ee6c0f72106d5a5cf9dddd4bc94b88a29aa. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/FR10S1823802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb4e1b5643b450a8e0bb765e3697ffe69ab43b417c7e64bf0011f4b84d2865e. 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/FR10S1823803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a33fcc14f1948dacd5a1399c68883ff279f875e42823863754d69c2499047ae. 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/FR10S1823804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e117aa6f5dfe36355b0a205559fa65e756ac602ec3f6c17fca8044e5703238. 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/FR10S1823805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30263ce2a97a626ac683ec597bb3fe039f70f93f5516150fe185248bb7c2b5f5. 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/FR10S1823806.